According to whom?
I haven't seen any claims of that being the case (other than you), just that there are similar decisions made by both of them.
https://mistral.ai/news/mistral-3
https://www.reddit.com/r/LocalLLaMA/comments/1plpc6h/mistral...
https://www.reddit.com/r/LocalLLaMA/comments/1plpc6h/mistral...