You're right of course. It makes me wonder though about the legitimacy of keeping someone's name next to an answer, and in principle allowing the answer to be e

You're right of course. It makes me wonder though about the legitimacy of keeping someone's name next to an answer, and in principle allowing the answer to be edited and updated, but preventing some kinds of edits. One might reasonably claim that SO is doing something equivalent to saying "this person thinks the answer as written is true and implicitly endorses the products involved". YMMV, but publishing something like this, especially with the knowledge that the person would like the post removed, could be considered defamatory.