No, you are missing the point entirely. They testify ANONYMOUSLY with only hearsay. Actually, there is only one reason they would possibly want him to remain anonymous, and that is that his very identity would expose him as a Dem operative. That is obvious, he is someone well known to be an anti Trump Democrat hack, that’s why they are guarding his identity.
You are correct, an anonymous witness with 3rd hand information would go over big in a court of law.
What has this country come to when an anonymous source with information that is 2nd and 3rd hand can bring down a sitting president. If that happens this Republic is dead.
He's a rumormonger.