It's true, Greg is in great physical shape, and he's doing routine exercises for muscle memory. But watch him in comparison to Thomas, his housemate. Speed and concentration are night and day here, and you see Greg's body trying to hold itself together when sitting www.instagram.com/reel/DOWg6Qn...
The energy isn't 100% there. People who met him in conventions or saw his previous IG posts can see the difference. There's more to this story that he's putting on.
Reading fan comments state three things: 1) People are ignorant of the effects of Parkinson's, or; 2) People don't want to accept that his health is actually deteriorating, or; 3) It can be cured (it can't)