Author, consultant, pro audio/video specialist, tech journalist and broadcaster Allan Tépper voices his suspicions that Apple’s Studio Display is not a true 10-bit panel at all but 8-bit FRC and discovers that it is limited to a single framerate/refresh rate, making it a much less attractive proposition for video editing/grading.
“Despite it’s raved internal speakers and other unique features (i.e. microphones and webcam), I cannot recommend the so-called “Studio Display” for the Program Output for video editing or video grading (unless Apple opens it to many more rates via a firmware update). It may be fine for other things like graphic design. For video editing or video grading (etalonaje), most of the DreamColor monitors I have reviewed are more appropriate since they accept the full range from 23.976 to 60 Hz, including exact 24, 25, 29.97, 30, 47.952, 48, 50, 59.94 and 60”.
The Daejeon Chronicles 
https://www.displayspecifications.com/en/model/ef652ae9
According to them it’s a native 10bit but they have been wrong before. But if it’s Apple then I wouldn’t give the benefit of the doubt and bet it is an 8+2 panel.
It’s admirable that the author also takes the time to explain why it is that we want a refresh rate double the frame rate of the video, noting that a native refresh rate of 24 would be intolerable – and, if I’m not mistaken, an even higher refresh rate is desirable for HDR.