Drupal 7: How can I display nodes of specific author in a taxonomy term?
I probably wouldn't have used a taxonomy term to store that info, but that's not a big deal. 

It sounds like you want a block containing the information in the taxonomy term to appear on a user's post. 

You need an entity reference connecting a user/author with the appropriate taxonomy term.

Create View that is based on the taxonomy vocabulary. Use a "contextual reference" starting with the post's node id in the URL to a relationship to the author of the post to another relationship to the taxonomy term using the entity reference.