The Guardian in another article explains that they are annoyed because Musk used twitter to promote his preferred candidate.
The Guardian itself used their own platform to publicly endorse Harris.
This deja-vu of childish antics is just comical in 2024
Isn’t The Guardian a UK publication?
That's how newspaper endorsements work. In this case the writer of the endorsement cannot themselves vote, but their opinion can still have weight.
The Economist, another UK-based periodical with a more right-wing stance, explains why it endorses candidates:
https://www.economist.com/the-economist-explains/2024/10/31/...
The American election is special, in that it's the "leader of the free world". What we do here affects everybody, in a way that even the leadership of Germany, France, and England doesn't. Perhaps we'd have an opinion about the leadership in Russia or China, but they don't have free elections.
The government should probably refrain from making an endorsement, but if people can't figure out the distinction between a government and a newspaper, that's their own lookout.