The yellow vest aren't a political party, they may have individuals running but that page wasn't one of a political party, they aren't even an organisation. This is purely Facebook enforcing political censorship to please the French government, there is nothing normal about it.
People are not forced to stop talking about politics on a public forum the day of the elections, that's complete bullshit.
It would be like saying, that people gathering into a bar on election day are barred from talking about politics. There is absolutely no such law that mandates that in France.
So please explain us what is normal about it again?