I think the pattern is also important per se. You can meet the pattern in the future, in another place.

It's a pattern of how to appear reasonable, cast doubt on everything, and yet never say anything tangible that could be used against you. It's a way to suggest that other people are wrong somehow, without accusing them directly, so they can't even defend themselves. It is not even clear if the person doing this has some specific mission, or if breeding uncertainty and suspicion is their sole mission.

And the worst thing, it works. When it happens, expect such person to be upvoted, and people who point at them (such as Richard), downvoted.