As I recall, it is expressedly forbidden for a Muslim to socialize with non Muslims, or even go into their homes.
If Cheema was a practicing Muslim, especially a practicing Wahabbist, it is unlikely he would ever live with an infidel.
I think using alcohol and frequenting strip clubs are also verboten, aren't they, but that didn't stop some of the 9-11 loons. Maybe, if this guy was an Islamist, living with an infidel is part of the cover.
According to rumors, there were three Pakistani's living with him -- they don't know if the other two were students or not.