The guy is certainly far from perfect, but I think he’s pretty reasonable overall, and that the complains above are nonsense.
He certainly slowed up on the debate prep over time, but he’s also basically stopped debating. From what I understand, his rationale was that you can’t get across all statistics, and that the people he was debating weren’t meaningfully backed by the data in any case so it’s fairly easy to find and debunk those syats/studies on the fly, which he frequently did. I don’t think it negatively affected his performance all that much.
It’s a valid complaint to make, though I don’t personally think it’s particularly material, and certainly has nothing to do with the nonsense complaints that were made above.