Yes, it is.

I use the gimbal with the GoPro Hero 6 and as far as I know there are no external differences in the housing to the GoPro 7.
The G6 is available in several ways (packed great for the GoPro FeiYu Tech G6 Actioncam Gimbal / or for small cameras, there is also the possibility to use the GoPro with the frame FeiYu Tech G6 Plus Actioncam Gimbal