Just barely a copy of The Player That Can't Level Up he even ends up with a demonsion he c...

And then?

Im just saying that thus is a rip off ofthe player that cant level up or at least loosely a copy of it.

Not even close. He is a demon lord that got defeated by the hero before reincarnation. It’s completely different from “the player that can’t level up” the only thing they have in common is that they can summon undead to help them fight. Even that both storylines went opposite side.