Reading Creating a pull request the labels should be assigned by the creator of a PR, so “Needs feedback” being directed at the creator is weird IMHO. Also, any activity on the PR should be read and acted upon by the creator (why would one open a PR if she’s no longer interested in it?), so simply asking a question should be enough to trigger feedback. I didn’t even realize we have both labels. 
And “Discussion” is described as “PR is blocked by discussion” in that post, so it would be something else as well.