The argument was that Allen choked in the playoffs and that was proven to be wrong. The last time they lost to KC, KC got a very fortunate spot. If Buf would have had the first there the game would have been essentially over. You also ignore the fact that buffaloes defense was not great in their playoff losses, or the fact that Buffalo has not really had great WRs that I call recall.
Allen does need weapons, the only good WR he has had is Diggs, but he has had a top 5 RB for multiple seasons and a top 10 defense for the majority of his career.