From a technical standpoint it's interesting whether it's deliberate and whether it's compression, but it's not a fair criticism of this video, no. Dismissing someone's concerns over hair splitting is text book "well actually"ing. I wouldn't have taken issue to a comment discussing the difference from a perspective of technical curiosity.
I agreed that the output was bad! I'm not dismissing their concerns, I was explaining that their analysis was not a good technical explanation for what was happening.
"Non-technical" isn't an insult.
What you call "well actually"ing is well within limits on a technical forum.