“He made statements about the “rotation” of the Sun and the moon relative to the earth and the size of the moon relative to the sun and earth which were not accurate by today’ standards.”
His statements were not accurate, period. As was noted, the RAMBAM was simply repeating the prevalent understanding in his time.
Referring to “today’s standard” implies that, perhaps sometime in the future, it may be discovered that the universe really is geocentric which, of course, would be nonsense.