Yep. If memory serves me, early Arri's were RGB, not RGBW(not sure if they still are or not, I use Gemini's not SkyPanels. The Gemini's have better white light rendition). All of mine are either RGBW or RGBAW/WW, with the exception of the Hives, but they're using five or seven different colors of emitters.
I actually meant with all RGB lights including RGBW RGBWW.
They explain it in this video https://www.youtube.com/watch?v=5U-F7EhLp7g
It's best to gel.
Are these just rebranded C-Stands? https://cinelight.com/studio-c-stands/c-stand-330-cm
They look a lot like those from Neewer and Falcon Eyes...