Primos just trying to sell you something new. I have a Cuddeback infrared camera, you can walk in front of it at night and it will snap your picture and you never know it, no flash. Now, maybe some infrared cameras do...I'll admit. Cuddeback's do not.
not sure about the Cuddeback but all other IR game cameras i have seen have a red glow (not really a flash) when taking pictures at night... I have a Primo's blackout and it does not have the red glow that other IR cameras have.