Sorry to ruin your day, but very few moves that say 0 on block are actually 0 on block, at least last I checked. Maybe the move list updates fixed some, but they seem to vary from move to move, both in being minus or plus. There is some that are actually 0 though, like Jax b121.Now if only we can get PL to stop saying being neutral is actually being +1 in this game.
This is just how the move is though, not some weird mechanic. Definitely not all 0 on block moves are +1 though, if hes saying that.