That was my thought as well. He's known for trying out lots of wacky random mods, so one could imagine a case where he believes the runs were legit, but actuall

That was my thought as well. He's known for trying out lots of wacky random mods, so one could imagine a case where he believes the runs were legit, but actually he had left a mod enabled by mistake, or similar. Or (much less plausibly), it's at least superficially possible that there could be some minecraft bug related to mod handling, such that his game client wasn't in a vanilla state even though he really had removed all non-standard mods.