I see. I guess that's where the definition of starvation has to be quite clear, and that's a very hard task especially with terms like 'starvation diet' sometimes being used in the media to describe emergency weight loss strategies which may in some cases be saving people's lives. I think I go along with
@Guzzler's view that it's nice when words mean something, so we shouldn't be using terms like 'starvation diet' unless the diet is intended to kill or malnourish people.
Certainly I'd say people in concentration camps in WW2 were, to put it as mildly as possible, being abused, and for a very long time, and the people feeding them probably didn't really care if their prisoners stayed alive from one day to the next. I'd call that a starvation diet.
That's possibly a very different thing to eating 800 calories a day from food that's carefully designed to contain a good balance of vitamins, minerals and macro nutrients required to sustain life, for a brief period, and not being asked to plough fields and build structures while on it.
That's not to say that lessons can't be learned from the extreme and applied to the everyday - it's certainly right that anyone going on a VLCD should be made clear of what to expect, and sadly they aren't. You certainly don't see warnings about reduction in RMR and the likelihood of over-feeding afterwards on these 200-calorie meal replacement shakes.