Who protects moms against dastardly dads?

If you go to the link included there is an audio file of the man speaking to what is presumed to be the mother. He has shared in the post above the audio file that the child is in Grade 2, so that would be approximately 6-8 years of age (six being the lowest and 8 being the highest). In the first 15 seconds of the video, the father admits to "grilling" the child about events taking place at the mother's house on at least 4 different occasions. Why is this acceptable behavior if it is for a father who has weekend/holiday parenting time? The child should not be questioned at all by either parent about what happens when they are with the other parent. This is out and out wrong, and the father should be punished by having parenting time removed until he no longer "brings" the child into his "spying" on the mothers household.