My feeling and objection was related to this. I think he incorrectly conflated two different notions to create a single critique and used the probability, the likely reality of one of them, to imply the reality of the second.
We have what you just described, which I think is accurate and makes perfect sense and blows a hole in his fake news statement, conflated with a different and this time negative reality that there exists a partisan irrational lust or confirmation bias among liberals that too readily wants to accept as factual any and all dirt that may implicate Trump as horrible person.
Where I think I have my major disagreement with DSF is not in that liberals are free of bias or even insanity, but the appropriateness of his pointing that out in threads where the emphasis, it seems tome, should be elsewhere, say on the fact that we likely have a person who can likely be blackmailed over his Russia connections. Let’s get rid of Trump and then see how large a problem we have with the authoritarian left.