Take with a grain of salt until proof is shown, however when Dante first started picking up, one of the selling points WAS interoperability with AVB…
While Lectrosonics is hosting it, the document appears to be written by Audinate based on the branding on it, and matches my memory as well.
I am not really diving into technical details here, just giving broad strokes. Yes you are correct in that there is a revision of AVB that runs on IP, I have no idea who is using it or not, because frankly I rarely run into AVB at all at this point, as I said Dante has the crown for the time being in the live sound world.
In as far as Ravenna on Linux, can’t find any reference to it at the moment, thought I had heard about work actually looking hopeful in that direction at one point but can’t find it now, other than conversations like this…
Which suggest it may not be all that difficult to get them running, and AES67 being a more open standard from what I have been told, it could work towards that favor. I do not know of anyone working towards that currently. Funnily enough there was some work by Intel on AVB on Linux IIRC though.