I can say at Google we usually just had engineering tip posters in the washrooms they were usually very insightful and just written by other engineers at the company.

Stuff like how to reduce nesting logic, how to restructure APIs for better testing, etc.

People usually like them. I can't say I've seen what the parent post described so I imagine it's "the other" FAANG mentioned here.

Yep, I frankly thought Testing On The Toilet was pretty great.

That and nice washing toilets.