It's more that he lacks our Superman's weaknesses to magic and only his universes's Kryptonite effects him. 'The Real World' doesn't have magic so it can't affect him.
Something something, he's younger and was exposed to more yellow sunlight, something something he's our universes' only actual super being so he gets a boost for it.
Remember those silver age comics where Superman could survive the big bang and move dozens of planets at the same through the universe without getting tired?
Superboy prime is one of those Kriptonians
What about the old-man Supes?
Died at Crisis of infinite earths and reincarnated as current Superman.
Earth-2 Superman? Prime killed him.
Who is stronger, Silver age Superman or Superboy Prime?
it's funny
In fact if DC writers went to Yas Forums they would have prime literally making this very thread
Superboy prime is a Silver age superboy you retard.
Superboy Prime is just a teenager so he didn't reached his full phisical potential nor can control all the Silver Age extra powers well.
It’s kind of fitting that a vessel for fan aggression towards editorial would be the thing that kills Snyder’s edgy Mary Sue. Superboy Prime is still bitter he’s not the “real” Superman, even more so that he was locked away in the Monster Lands