They are presumably using the GPU for video encoding....
And the GPU for rendering...
So they should instead just be hooking into Chromium's GPU process and grabbing the pre-composited tiles from the LayerTreeHostImpl[1] and dealing with those.
[1]: https://source.chromium.org/chromium/chromium/src/+/main:cc/...
One of the first parts of the post explains how they are using CPUs only
They are very explicit in the article that they run everything on CPUs.
You'd think so but nope, they deliberately run on CPU, as per the article...
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