Answered: how can administrator remove a whatsapp group member without letting the whole group know about removing one member?

I'm afraid that it's impossible
The idea of a group entails that members can see a list of all members in the group and what happens to them . When a member changes his number, leaves, or is removed a message appears for everyone to see .
Besides, it is important for privacy that whenever someone posts to a group he is well aware of who is going to see it