I'm helping my dad setup Frigate. To be honest, I've read the docs a few times and wound up a bit confused about the need to add another HACS repo and install another addon for the full in-HASSIO managed solution.
This step should be in the list for verbose-ness anyway, and helped me realize that "Frigate" addons provides the Frigate integration, but that the (extra-repo-enabled) "Frigate NVR" addon was actually necesary for the HASSIO-managed frigate instance.
(Also, now that I understand it, I'm quite happy with it, seems slick!)