The women on this site built their muscle through training, nutrition and PEDs. You need all parameters together.
Training triggers the body to build muscle but specific nutrition makes it possible to build even more and faster. It also changes body composition with higher percentage of muscle tissue and lower bodyfat at the same bodyweight. PEDs make everything easier, more efficient and more importantly pushes the genetic limit of muscle building and body composition much much higher.
Just by using only PEDs, no training, you gain muscle without any effort. For men that has been show to be around 7 pounds. And for women PEDs have the potential to build muscle in upper body which is much more difficult for them.
These three triggers produce the FBB phenotype, that is a very high maintenance state for the human body and unatural. Once you lose one of these parameters body reverts back to a lower equilibrium.
Muscle not used gets broken down, muscle fibers are catabolized and recycled, bodyfat gets higher in accordance to what is normal for female body by fattening existing fat cells or in the worst case by adding new cells. Metabolism gets slower, food needs to be adjusted.
After stopping PEDs, Hormones might get back to normal, they might not and then special medical measures need to be taken or else deterioration in a worst state that the actual start occurs.
Zuzanna Korinkova did it after Russian officials forbaded her to do Bodybuilding..she turned to the Fitness catagory by stopping lifting heavy and instead lifted lighter weights.
I've never understood how female bodybuilders can lose that mass they've built without distorting the shape of their body.
I'll use Dani Reardon as an example. Obviously, she used to be a competitive bodybuilder with lots of mass and cuts. How was she able to just cut that mass to just look like a normal fit person? I figured that much muscle suddenly atrophying would cause either fat conversion or loose skin, or something.
Another quick example: Kim Chizevsky. Absolutely massive, somehow converted to fitness in just a year or two.