Read the post, they never blocked the activist. They just changed what they replied to a DNS query of an already blocked site to make it harder to detect.
1. Article you've shared is from 2025-02-26
2. New rules have been in place from 2025-07
3. The author hasn't been blocked at all. You're either a liar or you cannot read.
[1]: https://lina.sh/blog/telefonica-sabotages-me