Show all author products from specific category

Pass author data to the query. It should be that hard.

Author
Parameters

Show posts associated with certain author.

  • author (int) – use author id.
  • author_name (string) – use
    ‘user_nicename’ – NOT name.
  • author__in (array) – use author id (available
    since Version 3.7).
  • author__not_in (array) – use author
    id (available since Version
    3.7
    ).

Of course, I don’t know what page you are on or how you are determining, or needing to determine, the “author” so I’m not quite sure how to guess at the code.