Ok, but this is not a solution.
Be honest! If somebody link in his answer to a documentation-page,
do you want to get to an error-page.
Sure you can start by searching via the Search-Field at the documentation-page… but this isn’t really handy. And it’s not the idea of an forum.
It’s easy like 1,2,3 to add a short .htaccess-rewrite to fix this for the whole links in the forum (even for SEO with a 302 redirect). So why should they force everybody to land on broken pages and search for the right link. I don’t see why you argument against this.
I think they still not noticed, that this issue occur, and that’s the only reason, why this still happens.