Considering the fact that he is in the final weeks of shooting the film, I would say that he's probably got a lot on his mind. Maybe it's a jump, but I wonder if he would be writing an 880 word blog post right now that isn't, somehow, specifically linked to the film. Snyder mentions the feature, and thinking about music for the film, but doesn't specifically connect the two and state that lounge covers will appear in the movie.
But really, if done right, lounge covers could completely make sense in the alternate reality of Watchmen, where the same pop figures pop up, but in a different context since there were, for a time, masked heroes helping to keep the streets safe. Snyder says: "Although tonally they are vastly different in many ways, the film and the Cheese-y music share an in-your-face look at the world, calling bullsh-- on pop culture in an unapologetic way."
Here, here! But please, Mr. Snyder, check out Jaymz as well.