As the title says. Does that map nerf his Summon My Greatest Enemies power?

TMGE from chanos targets opposing characters.
While the map special rules specifies that a character can't target an another character or object if it's more than 6 squares away from him.
So in short playing Shadowland is a good protection against TMGE.
Don't forget that the new ravager prime is also a good one.

Yeah that's why I want him, sadly I don't have him.