I think that description is upside down: being sleep deprived during the week causes a large number of problems and sleeping extra on weekends doesn't have benefits, rather it mitigates some of the problems caused by the sleep deprivation. You don't get any benefits over someone who sleeps all they need during the week.
> weekend recovery sleep had some benefits after a single week of insufficient sleep
Just like 'ferros' described, if you have a single occasional week of limited sleep, making it up on the weekends DOES have benefits. The problem starts when you repeatedly sleep an inadequate number of hours during the week.