There's nothing to prove, it's a literal collection of quotes where you can clearly see the speech they're given is condensed into a sentence or two.
Do you talk like the people in that video do? Just make a statement like that completely out of the blue and then never elaborate on anything?
Missing context and a lot of nuance:
https://apnews.com/article/fact-check-pfizer-transmission-european-parliament-950413863226
If you take your information on how vaccines work from a random news presenter you're stupid, plain and simple.
Dude is an old fart and has trouble keeping distinct topics separate. Note how he rambles on about testing just before hand, chances are he was referencing everything else (isolating yourself when testing positive, hygiene standards, keeping distances, masks) in addition to the vaccine when talking about limiting transmissions but lost the thread halfway through.
The only thing this proves is that you need term limits for politicians and to get all these old farts out of the government and into assisted living arrangements, and I do mean all of them not just Biden.