The SEO strategy described in this article does not work anymore for gig titles. Now, Fiverr's search engine prioritizes titles rather than slugs. Fiverr will count your gig for a keyword even if it's not in your slug but in your title. Your gig will appear for that keyword on Fiverr. Did you notice this as well?
https://www.fiverr.com/support/articles/360011094958-SEO-tricks-for-gig-titles#:~:text=Create a short simple title,does not affect Gig visibility.&text=Create a username%2C with a,Gig's service to potential buyers.