He is already an elected representative in the French parliament, being part of the current government's majority. His political party and the government have already passed several laws that are very damaging to research and higher education (among other things, but these two topics Villani actually knows something about, and he should care a bit given his background). He has never said anything publicly about it, or only to support the government. I see this behavior as proof that he doesn't care at all about being a mathematician (well, except when it gives him credit he doesn't deserve), so he should just be considered another random politician, and he's not even a good one.
Edit: fixed "dommageable".