because steroids will help maintain muscle mass, and may even put a few pounds of muscle on you, while in a caloric deficit. Also.. testosterone is one of the strongest fat burners there is.. so why would someone not want to use steroids when trying to lose weight?
but
you cannot just start injecting yourself with hormones and expect the fat loss to begin. Your diet and training have to be in place first for you to see the results you want.
How tall are you?