I had originally typed up a long response to the person you’re asking questions to. However, I went back and deleted it because he doesn’t seem to engage with any true openness to have his mind changed, and I didn’t wanna clog the thread.I don't understand how that exceeds the "involvement" or "unbiased" thresholds of qualifying as 3rd party testing?
But to touch on this point above: third parties are very frequently biased. That’s why no definition of the phrase includes bias.
Is it better to use 3rd parties with limited real or perceived bias? Yes.
But it’s by no means a requirement for the term, and ZT is completely honest when they call Form a 3rd party.