Maybe [the UK is not on the list] because this article focuses on technical aspects of overcoming blocking of the global internet in those countries that benefit from improvements to the TOR infrastructure. Maybe there are no problems circumventing DNS-level blocking with TOR in the countries which you mentioned. Maybe those people arrested (source?) were actually able to technically access the platforms on which they raised whatever they had to say. So maybe, the post is simply about a completely different topic.
Looking into the situation in the UK specifically, I found a description of the potentially underlying issues [1] and those are indeed worrisome. I still fail to see why one would raise it in the way GP did to comment on the TOR post.
Others have pointed at the funding of TOR through the US. If there is actual evidence that this impacts the stated purpose of TOR (non-discriminating access to the internet, I‘d say), please share. Otherwise, my impression is still that TOR works as advertised and is working on solutions where it is not.
[1]: https://www.economist.com/britain/2025/05/15/britains-police...