Oh, no, it absolutely WAS. In the special edition of Deadpool 2, the Fred Savage version, they spend a good amount of screen time discussing fridging, and Ryan actually gets it dead on accurate. This isn't a joke, it's a real thing, I've talked with him about it!

That was literally the only part of that movie that I got to see. I don’t know when I’ll be able to see D3. Also my spellchecker seems to have developed a crush on Josh Brolin

Wait I thought Ryan didn't know what fridging was till after the movie came out

that whole "Once Upon A Deadpool" version is one of the best things ever!

So after he did it he found out about what it was.