Is muscle memory legit? Watch
That's a pretty disproportionate and overblown reaction to having lost a little muscle mass.
What does it even matter, anyway? As long as you're healthy, muscle mass is just another number.
On topic: yes, is it legit - when you're doing things which require actual motor control and dexterity.
But it sucks to see years of hard work go to waste
That's all that matters.
In my experience, yes but not the magical speed that people claim.
If you have some gainz still, then you'll initially appear to put on size quickly, but that's just glycogen just going back in and that alone will put a little strength on you. From there, as you know how to train and eat, you'll gain it back slightly faster than the first time, largely as you know what you are doing.
Imo it comes back like 10% faster and then that last bit to where you were exactly (depending on how strong you were) takes the same as previously. Perhaps 20% faster. You don't just bounce back 12kg of gainz
Inb4 someone mentins the guy who did the Olympia at 54
Sure you can beat people but yeah ... you can't beat time.