I commend Konami for actually showing that their game has a freaking FTK and not shying away with it.
Let's just hope the FTK actually goes through and not them saying "well actually you can stop the FTK"
If only he drew the field spell then nothing can stop the FTK.
Actually, even if he drew the field spell instead of the Little Soldiers, Ghost Belle still stops the FTK if he went for the revival effect of Rouge Doll lmao. The Field Spell is so much worse than people think. It only protects monsters on field from monster effects, so Ash, Belle, Droll, Imperm, and Bystials all work as normal, meaning it only really stops Nibiru, Veiler, and archetypal handtraps like Faimina (but not Izuna, since they're still affected by XYZs). The best thing the Field Spell could do is search Terror Baby so he could discard it off of Bisque Doll to insulate against Belle.
The card that would have let him FTK here is Condolence Puppet send Terror Baby. This prevents him from responding to Gimmick Puppet cards, turning off pretty much everything but Droll and Nibiru.