They don't hold the non una cuм position, they even have an article on their website about it: https://schismatic-home-aloner.com/una-cuм-mass/
As for them being CIA plants: maybe. I don't believe they are personally, but its possible. Present the evidence and we can discuss it, otherwise it's just vain speculation.
That said, they sure put out some really solid apologetical videos against EO and Protestantism for "CIA plants."
I was the one who originally posted that they might be CIA plants, I could be wrong on that point but if one looks at a lot of the evidence against them, it's pretty overwhelming that they have some serious issues and are very suspect.
1. It's well known that they filter comments in the videos they allow comments on and only leave comments up that point out how "great" they are or occasionally a comment that they can refute. There's even a few comments saying things like "Looks like these guys are the 2 Witnesses of Apocalypse!" but the Dimonds never remove those comments or in humilty correct them. Why?
2. If one looks at both sides of the lawsuit with Hoyle and not just believing what the Dimonds say about it, the Dimonds don't really come out smelling like roses.
3. What they did to Jorge Clavellina was disgusting and Jorge has a lot of refutations of them as he was a hardened Dimondite at one point and has first hand knowledge of what they're like. Dimond Data is the YT channel.
4. "RI" has a lot of material against them as well showing how they are Sarabaite monks and the mysterious death of Joseph Natale and how Mike (Fred) basically took his place without having the proper prerequisites. I don't really want to link this "RI" guy because of his radical beliefs on other things.
5. They threaten people who don't agree with them on every little point they make. Even making comments like "we know where you live" or "you wouldn't say that to my face you punk." Does that sound like monk behavior to you?
6. They've been pointed out by several people how they are wrong about JPII being the Antichrist based on the Church Fathers and just common sense but Dimonds still push it. Why? Sounds like an agenda to me.
7. They never talk about how they were wrong about this or that, no matter what, they behave and come across like they have all the answers to what's going on and will stick to their "script."
8. As someone pointed out in another thread they show people how to make a contract with Satan in their 3 hour magician video, if they had any prudence they would leave that out.
There's more I could say but I'll leave it at that as those are the most important points. Of course they will have good material as well, shills have a lot of truth on their side or else people wouldn't really follow them, they have to appear to be very Catholic and Holy so of course they will refute Prots and "Orthodox" but it's that 1% poison one has to be vigilant about. I was a big follower of theirs as well and thought about joining at one point until I was shown what fakes they actually are.