The Petty release is something of a break-through insofar has he allows that purchasers of audiophile vinyl might also enjoy an uncompressed CD. What a concept!
Tom Petty happens to be an audiophile.
He is also probably trying to make a statement against the industry by publicising the fact that hypercompressed modern CD's are indeed inferior sounding (and it is not the media itself - it is the mix/mastering process).