That's one of the dumbest things I've ever read. Rockstar puts an immense amount of work into assembling a soundtrack that suits the time period and city the game takes place in, because they realize that you spend the majority of the game in a vehicle, and the soundtrack is a huge part of the immersion. Rockstar cares about the soundtrack, and they spend a lot of time - months, probably - searching for the perfect songs for each game.
If R* didn't care about what was on the radio in GTA, they'd just use a bunch of shitty mainstream rap music to appease the gangster-wannabe retards that just want GTA V to be a San Andreas remake.