No it doesnt what?
As shown by previous posts it works there.
(and so the quote “For my part it seems to work fine.” is quite true)
If you have issues … then thats specific to you.
$ vainfo --display drm --device /dev/dri/renderD128
vainfo: VA-API version: 1.9 (libva 2.9.1)
vainfo: Driver version: Mesa Gallium driver 20.2.2 for AMD Radeon(TM) Vega 8 Graphics (RAVEN, DRM 3.35.0, 5.4.77-RAVEN, LLVM 11.0.0)
vainfo: Supported profile and entrypoints
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointVLD
VAProfileHEVCMain : VAEntrypointEncSlice
VAProfileHEVCMain10 : VAEntrypointVLD
VAProfileJPEGBaseline : VAEntrypointVLD
VAProfileVP9Profile0 : VAEntrypointVLD
VAProfileVP9Profile2 : VAEntrypointVLD
VAProfileNone : VAEntrypointVideoProc
So maybe you want to open your own thread about how vaapi is somehow broken for you.
Make sure to read this first and include system information: