ChipGuide and Greg's Riverboat Guide has scans of roulettes with the "Riverfront" name. ChipGuide also has a slot card with the Riverfront name/logo!

But alas, I have not seen any commentary about a name change. But then again, "Riverfront Station" may have been an embellishment that just ended up falling into disuse. However, if the original name was simply "Riverfront Station" then that should be noted in ChipGuide.