Question about Philips Hue Aurelle Basis BT

Yes, that is correct. With the ceiling luminaires, there is only the option of infinitely variable regulation of the light temperature and brightness.

Depends on what you mean by ceiling light... This one, for example, would be RGB, but price and design are debatable.... Philips Hue Centris Basis BT

I have retrofitted the Philips Hue Being coloured. The built-in power supply has enough power to run white and coloured in parallel. There is a post with pictures at the Being.
I think this should also be possible with the Aurelle.

Diese Lampe von Philips kann RGB: Philips Hue Flourish Basis BT