Author admits his mistake:

François Valentin @Valen10Francois · 16h I realize that I've used that word completely incorrectly for ages!

https://twitter.com/Valen10Francois/status/15241607219023544...

Thank you for the link. I too was confused how this could possibly be a pet peeve. I wonder what term he actually meant? Pet project?

I was very confused by that thread. I kept scrolling to find where he explained why it was a pet peeve of his.

Same. Lets not tell any SEO/journalists this technique for keeping us reading an article we might have otherwise dismissed!

I studied French for four years and I'm sure there are all kinds of things that I say in that language that would confuse native French speakers as much as François Valentin confused us with an errant use of "pet peeve".

I think he probably meant to say, "pet projects".

My favorite is when a French colleague wanted to send some "demands" to a customer. He meant "questions", "demander" = "to ask", he didn't realize that "demand" has a very different implication in English. Fortunately this was caught before he sent that email.

Another more serious mistake is that further down the thread he refers to the DDR as a "former Soviet Republic", which it absolutely was not.

Thank you. The overlays are enlightening, and I was confused by the title and the lack of negative commentary accompanying these maps.