Crystal Bay is a census-designated place (CDP) in Washoe County, Nevada on the north shore of Lake Tahoe. The population was 305 at the 2010 census. It is part of the Reno−Sparks Metropolitan Statistical Area. Prior to 2010, it was listed by the U.S. Census Bureau within the Incline Village–Crystal Bay CDP.
People living in Crystal Bay in 2010 took the US census.
To be included in the statistics for the census, they must have taken it. It's just not linear enough for the model to predict, is my guess.