I don't think the alt right can be said to have "claimed" it as much as the left is rejecting it and there is no other home in a 2-faction classification.
[0] https://www.politico.com/news/2020/08/17/statue-removed-fran... Note the name Voltaire
[1] https://en.wikipedia.org/wiki/Thomas_Jefferson#Memorials_and... Note the name Jefferson.
[2] https://en.wikipedia.org/wiki/Classical_liberalism#Notable_t... Note the names Jefferson, Voltaire.
Prime example for me were those talks about rail worker strikes. They were completely disallowed from happening. I understand the reasons, but despite not being any sort of leftist, I find it quite unfair that rail workers can't strike.
Police, teachers, actors and writers, etc. all have that right. Rail workers? Nope. I don't know what to call the political economic system we live under, but it seems to just be that our leaders make it up as we go along and allow whatever happens to be convenient and not blatantly illegal. Nobody gives a shit about rail workers, so legally blocking a strike by them isn't going to cause any problems.
It isn't that the meaning of the word is changing. There is a detectable (indeed, proud and vocal) anti-liberalism stripe in the people who most loudly disagree with Carl Benjamin. And a lot of his positions are classical liberal positions. The classical liberals wouldn't have been very impressed by the things he criticises (or him, one suspects, but ones character is different from ones political persuasion).