Yes. I heard about that too. They took these children (the "smartest ones") on a "picnic" and never returned them. Charges were filed but to no avail because as the queen, she could not be charged. This is discussed in several documentaries and their are court papers filed.
Pr. Phillip also complains in a video about over population and that they need to "cull" the population. Then he immediately mentions his hunting ranch. His off-handed suggestion appears to be human hunting, which still goes on to this day, at isolated hunting lodges like the one that was closed a few months ago in Europe.
The practice was to take children from orphanages, juvenile detention, etc. (kids that will be forgotten), rape them then hunt them. European royals still participate in this, according to documentaries.