When I ran the OP6 5 years ago on PostmarketOS it wasn't working. I had a PR open with the devs and we tried to figure it out but lost steam. It looks like someone on Reddit got it working two years ago:
So yeah, 5 years ago it wasn't so critical to have it yet, and by the time it became critical it also became supported. Perhaps that's why you keep reading articles that don't mention it :)