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Back then it was basically just Intel's integrated graphics that had first-class mainline support. The AMD linux support is a relatively recent shift historically speaking.
Intel really should get a lot more recognition for its mainline Linux graphics support though. Without their contributions over past decades we might not even have a modern graphics stack at all in-kernel.
https://gpuopen.com/amd-isa-documentation/ for AMD.
https://www.intel.com/content/www/us/en/docs/graphics-for-li... for Intel
ffmpeg is one very small but important part of a complex chain.
Or, I guess the other option is that you’re spreading misinformation.