Oops, the test I did in the second test is bogus (I didn't test as root).
However, it appears that owner validation is properly disabled: [inside the pulled guix]
scheme@(guix-user)> ,m (guix git) scheme@(guix git)> (owner-validation?) --> #true scheme@(guix git)> (with-libgit2 (owner-validation?)) --> #false
Greetings, Maxime.
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