@simon yes, it's this one: https://en.wikipedia.org/wiki/Mistral_(wind)

But it is persistent (unrelenting?). That's why it is not just vent/wind. Like, it will still take your hat off tomorrow. Not a French word, really. It's something I would hear old guys complaining about in Provençal when I was very young there.

In the context of an AI company, I take it to mean “progress will happen”