I was looking for info on the opposite effect, lower metabolism from crash dieting earlier today and couldn't find anything useful. However, using the term RMR (Resting Metabolic Rate) from your link I found far more interesting stuff.
The short version: yes crash dieting can lower your metabolic rate, but the effect is small, and not permanent.
It can be a difference of 10% of your RMR which is 60-75% of your total calories burned per day. Therefore crash dieting can cause you to burn 6-8% less calories. So that's roughly 1 lb of fat less lost (or more gained) per month.
The short version: yes crash dieting can lower your metabolic rate, but the effect is small, and not permanent.
It can be a difference of 10% of your RMR which is 60-75% of your total calories burned per day. Therefore crash dieting can cause you to burn 6-8% less calories. So that's roughly 1 lb of fat less lost (or more gained) per month.