@Alxoom33 as far as this release goes, yeah... its unofficial. all that means is that the maintainer has not applied to be the device maintainer. i dont know if you have noticed but
Blackjubel has been extremely kind enough to build many ROMs for a few devices. all the ROMs work great and Blackjubel even provides updates so flash with confidence.
as far as skyhawk goes, like all other current recoveries its based off twrp but all add different features that really improve over twrp. i personally dont use any because im currently using a pixel 3 and plan to move over to a pixel 5 depending on how bad the pixel 6 is.