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How to Enter the US With Your Digital Privacy Intact
(www.wired.com)
This is a most excellent place for technology news and articles.
Thats what he wrote right after your quote, implying that he hasnt tested it. Also this level of paranoia was always justified for US travel and he surely knows that. The thing is that the US is now probably worse than Russia or China when it comes to the chance for random people to be arrested. For political activists its probably equally likely but the survival chance in the US is still higher.
I doubt that the US restricts entry based on speech more than China.
https://www.theguardian.com/us-news/2025/mar/19/trump-musk-french-scientist-detained
It barely gets worse than this. This wasnt even for public statements, it was private messages. The only difference between this and China might be the scale at which it happens, but that is kind of hard to track.