I still believe that Biden is trolling - he can't be THAT cognitively impaired.
In the video below, he may or may not have been on a drug-induced autopilot mode - and yes, he is a career politician with nearly 50 years of experience - but people don't realize how difficult of a task it is to convincingly and flawlessly use a teleprompter to deliver a speech for half an hour.
(actually 2 teleprompters in this case.)