They're probably referring to this 2023 Reuters article.

https://www.reuters.com/technology/tesla-workers-shared-sens...

"...pictures of dogs and funny road signs that employees made into memes by embellishing them with amusing captions or commentary, before posting them in private group chats. While some postings were only shared between two employees, others could be seen by scores of them, according to several ex-employees."

Two-second Google search. It's not very charitable to accuse someone of lying without even looking. It's even mentioned in that mozilla breakdown.