Because the serum/injection of Kree blood that healed him/revived him didn't alter his base genetics at all/didn't make him a potential Inhuman, nor did it change his genetic structure to Kree? He's still human.
Personally, I imagine the Kree blood/serum has pretty much dissipated in his system - yes it left behind the compelling need to find the temple as a side effect - but other than that, all of Simmons analyses of his blood in season 1 came back normal. IMO it wouldn't bother me at all if it wasn't really brought up again, I think there was enough closure when his compulsions to carve ended.
That's just my opinion though -and I fully acknowledge the show could prove me wrong down the road.