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The Meshech Chachma askes: “Obviously Moshe did it specifically how Hashem told him. Why must the torah say so? and Why specifically here?”
The Meshech Chachma answers that the the bigdei kehuna contained Shatnez, something forbidden in clothing. Therefore, this halacha, which states to nullify the issur of shatnez by the bigdei kehuna, could only come from Hashem via Moshe. For no other navi can uproot an issur from the Torah (the exception being a ????? ???)
This is what the Torah is telling us here. Such a commandment to turn a blind eye to an existing issur can ONLY come from Hashem via Moshe. Moshe on his own could not even make such a commandment. Likewise a different Navi (or other leader type) EVEN IF THEY ARE QUOTING HASHEM, one shall not listen to them in such a case, for this “prophesy” of theirs is proof that they are a false prophet.