IMHO having done hundreds of full down autos in training in an R22 as the instructor, they are perfectly safe as long as you have a bit of wind ideally 10 knots being the minimum, and are not too heavy.
also i used to do throttle chops all the time and as long as you follow the safety notice advice in the R22 manual regarding "suprise throttle chops can be deadly", I believe these are safe too
i think the robbie is misunderstood, you just have to be nice to them and a bit careful !