The Tatler article was very interesting. I don't think it was a load of BS, I think it was quite true.
Tatler has insiders (for aristo/upper class/royal gossip) like no other paper, as that very class works for Tatler, is friends with employees and jointly hosts parties with them all in attendance. There's in particular during summer one big party and you can bet your last penny that everyone invited (aristos etc) plus all employees come. It's in summer and very secret/exclusive, they at times report on this party, but very minimally.
You have this with no other gossip mag. When they write something, they know what's up, because they are right there. They are part of that inner circle and if anyone knows the real gossip and scandals and whether any of it is true, it's Tatler.
Tatler only lost in court, because they couldn't prove anything in the court of law. Meaning, no one will come out as witness and no one will speak publicly. Everyone who contributed did so under promise it'd be anonymous. Obviously the subject and surrounding people of the article were not amused, so it had to be shut down.
Tatler's loss in court is not proof that the article was hogwash, but it very much is proof that it was close to the bone, otherwise the reaction wouldn't have been this big from side of the Cambs.