why did the shop rhodium plate my platinum ring?

hello all! I recently got my platinum engagement ring back from repairs, and was shocked at how shiny it was. I had assumed they just polished it, but I was feeling suspicious so I called them. They said they “absolutely” rhodium plate all platinum repairs.

Why would they do that?

I read online that jewelers do it sometimes to cover up white gold or mixed metal solder, but the shop also assured me that they only repair platinum with platinum.

I’m not necessarily opposed to the shiny look, but just wondering if this is sketchy to cover something up or normal practice?