I'm going to call that Bull- um - pucky.
TSA makes the call. TSA designed the program with a degree of randomness so that a hypothetical bad guy couldn't invest 10 or 20K gain entry to Precheck and be assured that on 'the day' s/he could skate through.
The Airlines's interest is exactly opposite, to make the process as smooth as possible for their premium flyers.
http://www.tsa.gov/what_we_do/howitworks.shtm
TSA will always incorporate random and unpredictable security measures throughout the airport and no individual will be guaranteed expedited screening.