You are correct, but this uses Lichess ratings, which are a bit inflated, and probably a variety of time controls including blitz. At levels of play below super-grandmaster with full time control the accuracy of play can be rather low, and picking a suboptimal move will often cost you half a pawn (or more) in engine evaluation. Add this up over an entire game and a one pawn advantage is easily lost in the variability of both players making compounding errors.