P.B.A:
1) Why didnt you mention to them the health issue for those that have allergies to milky products?
2) To say the halacha requires to wait 6 hours is a clear mistake. The halacha states a person should wait between meat and milk. period. Then came a discussion how long to wait. The minimum is 1 hour, machmirim wait into the sixth hour and those who are more stringent than that leave a gap of 6 full hours. The 6 hour wait is not halacha but minhag!
3) If the hechsher group were not aware there was milk in the product, does this not make it chashash chalav akum?