It's 2023. Pretty much everyone is using Unreal Engine, Unity or Godot for the bravest. Custom renderers are a thing of the past. The reason game developers don't release on macOS and Linux is the costs of testing and supporting the platforms, not the availability of the renderers.
Specially since Android games, developed mostly with the NDK (C/C++/OpenGL ES/Vulkan/OpenSL), could be easily ported to GNU/Linux, yet studios don't even bother.
Your site lists Linux Vulkan as "Support in 3rd party drivers not guaranteed" when its supported by every driver relevant for gaming. The same comment is there for Linux OpenGL which is just plainly absurd. Not a site anyone should use as a reference.
This is a good table for Vulkan support across platforms: https://www.ravbug.com/graphics/
And on Linux your best bet is to run DirectX through compatibility software like what SteamDeck does.