I wonder what Starfleet's protocol is for determining whether a one star admiral is called a Commodore or a Rear Admiral (Lower Half). Geordi is a Commodore, Beverly is an Admiral, but they wear the same rank device. Maybe it's up to personal preference?
I think the idea is that they've always been called Commodores and we're retconning away the whole thing where they started calling them Rear Admiral Lower Half. It was kind of a stupid idea in the first place.