Well, that's your assumption. I would preface that with "probably", since we don't know this for a fact.

> Most of them did not mention any relationship: hence the "psuedo-astroturfing"

Side note: I think you mean "quasi-", not "pseudo-". [1]

But, more to your intended point: the point I'm getting at is that that you're really stretching the definition of astroturfing here, even with the weasel wording added on it.

Astroturfing is a central campaign coordinated by a vendor in a manner as to appear decentralized. It's really an accusation against the central entity rather than as the pawns they're using in the process. So quasi-astroturfing might be a situation where (say) the vendor doesn't actually organize the campaign, but pays an advertiser who internally organizes the campaign without the knowledge of the vendor. The vendor might overlook signs that this is happening, without directly supporting it. Or they might not realize it at all. That's something that would be close to astroturfing, but not exactly it.

However, people advocating for a product due to their genuine personal opinions in a way that's clearly uncoordinated and unsupported by the vendor is not remotely "astroturfing" in any sense. It's a biased expression of opinions, with a potential conflict of interest (if they're still affiliated with that vendor).

All of which I think matters not only because words matter, but also particularly because this site's rules treat astroturfing differently from "someone is biased on the internet", and the admins very much don't want accusations of astroturfing without evidence.

[1] Pseudo- means fake, like how pseudoscience is fake science. Pseudo-astroturfing would be fake astroturfing, or the faking of fake grassroots support. Meaning you'd be accusing people of being real grassroots supporters who are pretending to be fake ones, which would make for a funny accusation.