I participated in the thread to which you referred:
White House Attacks “Cheap Fake” Joe Biden Videos As They Spread Across Right Wing Media And Parrot Donald Trump’s Talking Points (Analysis) LOL - the newest talking points: - Cheap Fake Don't you think that the fact that people feel the need to fake Biden videos and we don't with Trump says...
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I argued with you about your take on it.
What you're conveniently leaving out is that fact that in this case, your side (i.e. the "Biden is too old" side) was guilty of making some assumptions based on incomplete information that mirrored other faulty interpretations your side had made in other cases where the footage was obviously selectively edited or presented. You, personally, made a number of assumptions from his facial expressions that you had no way of verifying, yet took to be accurate, and expected the rest of us to be accurate. It's not "gaslighting" to say that you were presumptuous. You were. You may not have been wrong, ultimately, but you were presumptuous. It's no different than lefties who predicted that Trump would try to stay in office if he lost reelection in 2020 (Marc Maron, for example, has a bit about this in his special from 2020) - they were presumptuous, but also turned out to have guessed right.
I'd argue that many other folks on the Right who've argued this point have been untrustworthy, using selectively edited footage and just generally acting in bad faith. Biden obviously looked slower and older, but it's hard to assess the degree to which this is the case when the folks making the claims are being deliberately dishonest and/or are so media illiterate that they can't tell when somebody else is being dishonest.