Nope, "number of pawns" is only a notional number, it's a score calculated by a chess engine. Being 1 pawn ahead may just mean a particular position where one side has an equivalent advantage though not necessarily being a physical pawn ahead. Another aspect is sometimes you're a physical pawn short, but the position evaluation may only show -0.3 pawns against you, meaning you've got positional or counter-play advantages to compensate. Often players will sacrifice pieces for counter-play and activity.
Chess engines also implement a heuristic called 'contempt' where they may make a sacrifice in order to avoid a drawn position, when faced with an inferior opponent.
Your response has absolutely nothing to do with the point the parent poster makes and completely and utterly misses the point.
He is arguing that "percentage of winning" is not linearly related to "pawn or equivalent advantage". That has got nothing to do with whether those pawns are physical ones or positional advantages that have equivalent value.
Yes, I know how computer evaluations work. The fact that they take positional as well as material considerations into play doesn't change the point, which is that playing a +5 sure-win move instead of a +8 sure-win move is not a horrific magnitude-3 blunder the way that playing a -2 move instead of a +1 move is, whatever your units of magnitude are, because what really matters is the change in the expected result of the game.
Chess engines also implement a heuristic called 'contempt' where they may make a sacrifice in order to avoid a drawn position, when faced with an inferior opponent.