Question about GoPro Hero 7 Black

If you mean stabilisation? It is also available at 4k/60.

Mic Bergsma has published a video on youtube that shows all available resolutions with HyperSmooth, whether in 16:9 or 4:3 format. I don't know if I'm allowed to publish the link here, but that's the name of the video: GoPro Hero7 Black: Which Resolutions Support HyperSmooth - GoPro Tip #623

Hyper Smooth only works at 4k 30p why not at 60p as promised? only standard stabilisation is available there....