Yes, that's correct. Metabolism slows in two ways when you go on ANY diet. It will correct itself as you lose weight, but there is also another part of the metabolism that slows more when you reduce food.
On a VLCD the adaptive part will reduce more, but then it stops reducing when it gets to a certain level. That level is always higher for the diet to work.
When you start eating more again (as in the steps up to maintenance) your adaptive metabolism will start to go up again. That part will be restored to it's former glory. Of course, the metabolism that adapts to the smaller size will stay as it is ie, a little slower than before you lose weight as there is less bulk so needs less energy.