Yeah if anything the remake was a boon to EDG, and then they banned Morde on blue side cause they realized Fnatic had a plan for if you first pick Morde. I was expecting this to happen once best of 5's started honestly, for teams to leave him open as bait and then just counterpick him. Teams don't pick him because he has no counters and is a versatile pick, they pick him because he's the easiest champion in the game to snowball with, even despite his setbacks. His exp advantage and dragon ghost are literally so OP that an otherwise worthless champion is suddenly worth picking. Fact remains though, you can't safely first pick Mordekaiser in a structured team environment because as powerful as he is, there are tons of champs who shut him down, Fnatic picked a comp full of champs that do just that.
Morde is only 90% banned because teams just don't want to deal with him, not because he's insta-win. Thing is now that we've seen this, he'll probably stay banned for the rest of the tournament.