Not any form of interaction regardless of reason, but any unexplained form of interaction, yeah. Which is how it should be; if you're supposedly immune to everything because of being beyond causality, yet characters with no way to get around that can interact with you, that should be treated as an anti-feat.
I don't know if there is interaction without explanation in the case of Madoka or Arceus, but I can argue for Anos and Graham about the case of any possible interaction (The explanation will be a bit long but it won't be heavy to read).
The physical bodies of both only have Type 4 acausal, by exists outside the world's framework, order and reason altogether, order includes everything I already said
here and reason is far beyond order, but that's all his physical body has so we won't take it into account.
Anos' source and
Graham's true nature is where NEP Type 2, TD 2 (There is a CRT in progress for TD 3) and previously Aca 5. There is no one that has been able to interact with both, except Anos and Graham with themselves as they both share the same TD and Acausal nature, so that does not count as anti feat.
Venuzdonoa has been able to interact and destroy both NEP 2, TD 2 and Aca 5 and the reason is self evident, it is a weapon that is capable of destroying all things in creation no matter how tough, eternal or infinite it is, Venuzdonoa will destroy it alongside its reason. As I explained before reason is above order, therefore it is above Duality, Transduality and Acausality, Concepts, Law, Fate, etc. So it is not anti-feat besides it has the power of Anos' Eye which is also capable of destroying reason and it is the power of anos itself and the order of destruction. There is also the same Anos' Eyes that destroys reason.
Lay (His Sword was inside Anos' mother stomach which have given the power to Evansmana to interact with Anos source in other words, he was in contact with the destructive power of Anos lineage which is based on pure destruction without reason and was a weapon created specifically to permanently destroy Anos)
Sasha (Has Anos' Eyes which destroys reason and can manipulate Venuzdonoa) and
Eques (He is a chief god who has shown to be able to negate both the transdual and acausal nature of the misfits (Anos/Graham)),
TL.DR. There is nothing other than Anos power itself or reason that has been able to interact with Anos' source and Graham's true nature, therefore there is no anti-feat on the part of Anos or Graham.