There's some cunning at work here (one might say 'dull cunning', but let's just say 'cunning'). Uses phrases like 'it might be possible'. 'By mutual agreement'. He's basically setting the table for failure, and the ability to shuffle the blame elsewhere.
If he doesn't get what he wants, he can always just blame the EU with 'well, they didn't agree!' when he's not even coming to the table unless they just drop the whole Irish Backstop thing.
Then he clearly tries to ignore the question he doesn't want to answer (or even understand), then tries to deflect with personal insults, then...
...I just noticed he does the same thing with his tie that Trump does to cover his physical issues....
...then starts rambling some pie-in-the-sky thing about 'goodwill' and 'trust'.