Welcome to the forum and sorry I had not answered before!
No, unfortunately, that schedule is not good for any bird and I'll tell you why. Birds are photoperiodic (a long word that means that their endocrine system is governed by the length of lighthours) and need exposure to dawn and dusk to set their internal clock attuned to the seasons. It's the different light (you know, that rosie/orangey/golden light that happens at sunrise and sunset) that happens at twilight that turns on or off their 'internal clock' (circadian cycle which, in turn, governs the circannual one). When a bird is exposed to long days all year round, their endocrine system goes whacko. One of the consequences of this (there are more) is that they produce sexual hormones all year round, year after year (something that NEVER happens in nature). Birds are not like mammals, they don't produce sexual hormones all year round starting when they develop sexually and stopping when they reach a certain age. They only produce them during breeding season and, when this is over, they stop - only to start again, in the next breeding season. When they are 'resting', their gonads (sexual organs) become inactive, they shrink and go dormant. When they are in breeding season, their organs start to grow and prepare for reproduction BUT if their endocrine system is out of tune with the seasons, these organs continue growing when they should stop and become so large they start displacing other internal organs (birds don't have, like male mammals do, external sexual organs) causing first discomfort and, eventually, chronic pain. This discomfort/pain added to the sexual frustration (the birds are intensely horny but can't relieve it) is what makes them scream and bite. See the problem?
GCC's, on top of this, have another problem: they are extremely needy. These little birds need hours and hours and hours of one-on-one, much more than other species. And, if you add the sexual frustration to not enough time with their chosen human, you end up with a bird that screams and bites. And this is why GCCs are considered nippy and loud when, in reality, they are not. I have only one female now but had four GCCs total (the other three were rehabilitated and adopted out, a single male and a pair that bonded in my house) and they had all been given up because of bites and one of them because of constant loud screams. All of them stopped biting and screaming once they were under a solar light schedule, the right diet and had plenty of out of cage and one-on-one time. Codee, the female I now have, is the easiest bird I have in the house. She is a great eater and bather (bathes almost every morning), she is super affectionate (first thing she does when she climbs on my finger is quickly run up my arm to give me a kiss on my cheek -every single morning!), never screams (well, she does when it's time for her dinner
) and never bites (so much so that she is one of the two birds that I allow my grandchildren to handle). But this is a bird that gets a fresh food diet with large portions of fruit every day, which is kept at a STRICT solar schedule, which has a mate she loves (he is an old, handicapped, wild-caught ex-breeder peach front conure) and which spends a solid two hours in the morning on me every single day.
Parrots are not easy pets to keep. I have dogs, cats and birds and would much rather have 20 dogs and 20 cats than two parrots because I can buy good commercial dog and cat food while I have to shop in three different stores and cook for the birds. But the worst is the solar schedule and their need for my company - I can't go anywhere in the morning because I need to spend time with the birds, I can't invite anybody to dinner unless it's during the summer because the birds in the living room and dining room cannot be exposed to light or loud/unfamiliar noises once the sun sets and I can't go with my husband on vacations unless I make prior arrangements. In March, we will have an important anniversary coming up and we are planning on going somewhere for a weekend and I am already making arrangements for this because I need a person to come in and stay in my house (paying, of course), the daughter that lives nearby needs to come in every day and check on the birds and I have to leave all the food prepared, labeled with their names and in baggies in the fridge which will take me an entire afternoon to do. And this is for two measly days!
n May or June, I am going back home to meet two grandchildren that have been born since I last went (alone, of course, because my husband needs to stay behind to watch over my birds - he will be going later in the year) and, even though it's a trip of about 16 hours (utterly exhausting!), I am only going to stay for a week or 10 days max because I can't leave my birds for longer than that. When people say they are slaves to their birds they are not exaggerating one single bit!