1 Fat doesn't turn into muscle
2 Androgens burn fat, whether you work out or not
He used gear for this transformation
Covered that in my post. Well aware of androgens fat burning properties as well as aware you're going to eventually be married to them if you don't maintain a specific lifestyle/workload with them or worse just stop taking them and go back to your previous lifestyle.
I've known plenty of folks in his exact position that never did a damn thing about it. He dug himself out of that hole of possible lifestyle related illness and I salute him for it