lol
@katsulynx (who is developer of that add-on) was with me during developing my add-on. He (who developed other add-on) knows exactly that our works are totally different things. I didn't check that add-on, but I think we even used different libraries in our add-ons.
Also check
this post of me. As you see he liked that post. Is he crazy to like the post of the person who is misusing his works?

If you think they are the same, then just don't use it. (although if they were the same, I wasn't crazy to lose my time to develop it. Because although I'm not professional developer, some users asked me for paid add-on requests. I would spend my time for those requests.)