It can if it's run by the administration of the place
There should be a difference between the "official Facebook of X" and the "official site of X". Billy Bob and Aunty Jane should be free to communicate to the world via Twitter, but the government, IRS, emergency services, etc. better avoid the level of indirection. Provided they care, of course.
They have an official site (it's a wordpress one, but still)
Aren't official things supposed to be public? The french govt. can easily run a mastodon server for the municipalities.