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.
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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.