The top comment https://news.ycombinator.com/item?id=45440465 makes it clear that what you're referring to is exactly what is being deprecated.
Doesn't surprise me too much though, Gmail hasn't seen much maintenance and polish over the last few years.
I have a test suite that accesses a gmail account through POP. It's a regular gmail account. Will that be affected?
Edit: Okay I think not. But man is this confusing over whether it's Gmail that's doing the fetching over POP (a feature I had no idea existed) or somehting they're calling a third-party account fetching Gmail emails over POP.