Sure, it is possible that a rookie wide receiver is a complete non-contributor on offense just like Chase Claypool was. Busts happen, but the whole point is that at least there's upside. What is Claypool's upside? That he starts looking like the player he was the first half of his rookie year? It's not like he just recently started sucking, he has been in decline for years now.
You have to be completely delusional to still be defending that trade, the pick became the equivalent of a first-rounder and it was given away for a player who produced zero scores and only six first downs in seven games.