I think he photoshops them
And the reason why I say that is when he’s in moving videos they look like your average teen biceps and he’ll get closer to the camera to make them seem bigger but majority of the time he’s just having videos of photos so he can easily edit them
 
He posts these old 14-15 year old photos of himself but posts 18-19 photos of himself after a few cycles and says “one year transformation”… and says “glow up”… it’s a little strange
It’s because he like many of these younger fitness influencer guys, are really insecure. The editing of the pictures and videos and the self deprecating memes really reveals it all.