I was given this same "advice" from a fellow coach this year on how most officials do not count defenders when in goal line or extra point situations.
In addition, the same coach provided me with some valuable "clock killing" techniques. We play with a running clock except for when inside of two minutes. It was suggested that if you have the ball inside of 4 minutes but outside of 2 minutes, the lead and want to run the clock without running a play... have your offensive lineman false start. The game clock continues to run and you are given an additional 60 seconds to call your play in the huddle. Use as much of the 60 seconds that you can in the huddle and at the line of scrimmage, by the time you run your next play, you should be inside of the two minute warning. 2:00 plus minutes are burned without running a play.