While psi do exist in Fo universe, that specific group might or might not be canon. In FoT, you see some psi raiders able to tame animals (including mentioned above deathclaws) and control them through their power. In FoT, released after Fo2, but chronologically taking place before it, before the Enclave is even known, you have a full species of talking deathclaws, that don't even try to hide that they can talk.
The creators insisted than they are al dead and they there will be zeron talking deathclaws in upcoming episodes. In Fo2, the only talking deathclaws are those experimented by the Enclave and those creatures try to hide it. Their backstory is already established in Fo1 as NOT coming from a vault.
In FoT video introduction, the BOS is said to be born from a vault. I assume Fo1-Fo2 graphics override it, canon-wise. Graphically, the deathclaws, ghouls, & super-mutants are depicted as visually different than in Fo1-Fo2. I played FoT the most (after Fo1-Fo2) so i can link a few elements. About the official canonicity, if i recall things right, the new publisher had chosen to remove spin-off from canon to have less material to take into account in their sequel, while the support of FoT from the community got them to reconsider it canon instead of semi-canon.
