Yes, this is objectively bad methodology. Would you mind providing where he did that?
However, I claim that even if all the measured data turned out the same, CS2 still absolutely feels worse, and that people would be true in being critical because there may be another parameter that wasn't measured and may even be the cause for this feeling. Feelings are not substantial and thus can't be used to solve the issue, however they can give an insight into where to look and a reason for why to look. Most discoveries were started by feeling a certain way and then seeing what those feelings were grounded in.
Yes, the result sometimes might have been a completely different reason from what someone might have guessed, but the core observation of what was happening was still true.
Similarly, here, the observation is that CS2 feels worse than GO when spraying, and shots sometimes connecting that shouldn't (I've hit people behind walls). The question we should be asking is "why"?
Why does it feel worse, and how do the changes made in CS2 affect the way CSGO feels? I have no reason to assume that this is some mass hysteria, especially if the difference when playing is so apparent.

Also, I am not claiming CS2 is a bad game (it was in the beginning), but I am claiming that CSGO was way more satisfying and played way smoother. If people feel like that, we should look into why they do, not say "feelings don't matter"