According to the followup toot, Youtube seems to assume Firefox + Linux + aarch64 = HiSense 65a67gevs. This was reported elsewhere too: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+... ; that issue was then forwarded to Chrome's bugtracker (https://bugs.chromium.org/p/chromium/issues/detail?id=150011...) which was closed with the comment "I'm hopeful they'll eventually get around to fixing the bug that you've reported".

It sounds less like "let's help the poor Raspberry Pi users" or "let's make Asahi's experience worse" and more like "workaround for a buggy TV that nobody bothered to implement correctly".