In cold weather, parts fit looser. Supercharged or not, gas gets past the rings into the oil. If you bring them up to operating temperature and run them hard for a while, the gas will evaporate out of the oil.
Also, it is a good idea to change the oil more frequently.
This is not unique to Verado. It happens with most four strokes in cold climates. I used to have 800SC engines on the Great Lakes -- did the same thing.