https://businesssearch.ohiosos.gov/If you search for Cleveland Guardians you will find that the name Cleveland Guardians was in fact registered by Cleveland Men's Roller Derby LLC on January 4, 2017.
Interestingly enough there are active corporations with the name Cleveland Guardians Baseball Company that were registered in 1996 (a LLC) and 1998 (an Inc.), which means they have nothing to do with the recent Indians name change (there is a Trade Name of Cleveland Guardians Baseball that was registered on July 26, 2021 - i.e. the Indians).
There is also a Cleveland Guardians Charities that has been around since 1989.
Here is the Cleveland Guardians team page on the Men's Roller Derby Association web-site.
https://mrda.org/team/cleveland-mens-roller-derby/They are clearly identified as an active team in the association. They seemingly haven't had seasons the last couple of seasons because of covid.
This is just some crazy lazy work by the Indians.