Being a giant VH nerd/ Ed head, I've never heard of this.
I know someone mentioned that the 1st four albums are all tuned to Eb, so if someone randomly tried to play them on a keyboard they'd be confuzzled.
I'm guessing it might be alluding to many VH songs not simply being a I, IV, V progression.
Even Jump, (on keys) starts on a root V, inverted I, IV to V, back to inverted I. (I used to laugh because Panama's opening riff is almost the exact same rhythm and concept) and the guitar solo, goes to a flat VII (which would be a black key if you were playing Jump in C)
Why Can't This Be Love's bridge does a similar thing as Jump.
Right Now (in d minor, the saddest of all keys) does use a VI, VII, I progression in the chorus, which does equate Bb, C, d. (So you do have a black key in there technically) while the verse is Ed vamping arpeggiations over d, C, & Bb (I think, if I remember correctly)
On the contrary, Ain't Talkin Bout Love is just Ab & Gb over and over again.
