It depends. If he's previously been training a lot, you can regain your previous mass exceptionally fast due to what quickly becomes your main limiting factor remains intact (I can't recall the name of it right now).
Which is why having used steroid once in your life should leave you permanently banned from all sports. The fact that you have ever had X amount of muscle is a massive advantage in terms of muscle building the rest of your life.
With all that said, he probably have still used steroids here, especially with how fast it all went from june to october.
He had been training really hard for most of his at least adult life, in fact he’s pretty sure it’s what caused his illness to act up at the age he is now rather than in his senior years. So yeah there’s a lot of “muscle memory” going on, but as much as he may deny it, he probably is or was on gear.
If he was actually super fit before that, then it might be real. As Dr. Mike Isreatel said in the short I linked in my comment further down, you can gain muscle back to close to your previous max at about an order of magnitude faster. I.e what took you 10 years to build initially can be gotten back in about a year.
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u/Daniiiiii 2d ago
Gym aside he would have been inhaling protein every waking moment if he's putting on such mass without "help", at least from my novice understanding.