It's more the total combination of powers, it's what they're getting at. (Some more important than others.) The author clearly stated that in the intro.

Yes, Invisible Woman also has invisibility, but clearly she's not god-like. Nightcrawler can teleport, but he's not god-like.

I'd like to see you name ten of those thousands of heroes that seem god-like because of their total powerset. Ones that aren't already considered gods like Thor.