If you want RTX though (does it work properly on Linux?)

Yes it does. For example, Hans-Kristian Arntzen declared the DirectX Raytracing (DXR) implementation in VKD3D-proton as feature complete in February 2023 (https://github.com/HansKristian-Work/vkd3d-proton/issues/154#issuecomment-1434761594). And since November 2023/release 2.11, VKD3D-proton in fact runs with DXR enabled by default (https://github.com/HansKristian-Work/vkd3d-proton/releases/tag/v2.11).

Have people actually checked the versions there before making the suggestion?

F-Droid: Version 3.5.4 (13050408) suggested Added on Feb 23, 2023
Google Play: Updated on Aug 27, 2023

https://f-droid.org/en/packages/org.videolan.vlc/
https://play.google.com/store/apps/details?id=org.videolan.vlc

The problem seems to be squarely with VLC themselves.

And a decade ago, Google itself sabotaged XMPP in their version of embrace, extend, and extinguish: https://www.eff.org/deeplinks/2013/05/google-abandons-open-standards-instant-messaging

You know, there are several built-in functions in phones, that are already viable methods to communicate remotely?