Mr. Rex, this is an occasion where someone disagreeing with you will work in your favor!
Muto Corpus base 2 cannot grant a Virtue. In fact, Hermetic magic doesn't grant Virtues at all, just as Eyes of the Cat does not grant an animal Quality of night vision. Hermetic magic grants open ended effects which can mimic those things without specific rules for them, partially because the core rules existed before those things, and partially because it lets other magic traditions feel strange and exotic. When Methods and Powers grant Virtues or when Amazons inflict Personality traits on people, that's something CLOSE to what Hermetics can do but there's a definite difference.
What these boots do is change a person so they are well-balanced for a brief moment... without actually being the Perfect Balance Virtue. This is good for you because it might stack with the Virtue. Different effect.