Does this function's implementation mean that using posts to bump topics in said sections is now forbidden and should be reported?
Posts can still contribute to bumping the topic but only if the poster has earned merits and only once per user per 7 days. Rules haven't changed AFAIK, so if there are multiple posts in a row you can still report them.
I think asche is referring to those posts that are made only to bump a topic without any other purpose. For example some one just writes "bump" and post it.
Before these changes in bumping of topics, users were allowed to do this once per 24 hours. Are they still allowed to do that?