The quote that matters starts around 1:25, when Elmendorf says that, according to CBO's estimates, with the stimulus legislation in place, "the level of GDP would be a little lower at the end. That is, a net negative effect on the growth of GDP over 10 years." Elmendorf then confirms that CBO estimates that the economic drag will continue in the following decade:
SESSIONS: And in the next 10 years, since you’re carrying that debt and paying interest on it and the stimulus value is long since gone, it would be a continual negative of some effect?
ELMENDORF: Yes, it would represent a drag on the level of GDP beyond that, if no other actions were taken.