I did read the article before answering you. I referred you to the original headline because it better fits the article's contents, not because I stopped reading there.
In the article they are stating that Vodafone users can not access to proton services. They have written they have seen some complaints from other ISP users as well but there is neither a statement nor a clue that it is blocked by other ISPs as well. After all, the fact is that it is not blocked by other ISPs only by Vodafone.