Search does show up games made by your search term. Either there are no indexed games by that creator or it is a very, very generic name that is part of many game titles. I imagine you would have trouble finding games of a creator named "fps".
https://itch.io/search?q=BobbyWojak
Also, search engines do not care how popular a publisher is. If it is a non generic name and you search that name, they find it.
https://duckduckgo.com/?q=itch+BobbyWojak&ia=web
And, uhm, if you do know the name, just replace the part in front of replaceme.itch.io with that name.