I don't think licensure is part of the definition of "engineer"
I don't know what his point was, but as a "software engineer", I sometimes wonder if I should be called a "developer" and let my PE friend keep the "engineer" title, just for clarity's sake.
https://www.washingtonpost.com/news/morning-mix/wp/2017/12/0...
https://www.canadianconsultingengineer.com/engineering/quebe...