I saw this first over a year ago, and forgot about it, and have spent the last month trying to find it. I was successful today.

I am linking a summary because the channel was MASSIVE. https://www.youtube.com/watch?v=8B1sRPwK248

It had normal videos, and then periodically strange ones, that included a blue triangle with a pizza slice overlayed ( https://www.youtube.com/watch?v=edscczKVvVw ), a discussion aimed at the children watching about how their mothers beat them, and some VERY long VERY repetitive videos with Hitler, DeepMind, and some odd claims.

The original channel has been taken down, but some of the videos can be found. I'll link here to another channel that has preserved some of what the original had, plus some additional videos. This channel has a 3 month old video that directly references PG in the title. I have not watched it.

https://www.youtube.com/channel/UCYJzjmdSd-9gA-XJgIPgrmQ/videos