A speech is the definition of a hypothetical. I can show you a million Trump speeches that "show" the opposite. Something tells me you wont take those as gospel for some reason.

>It's not like trade deals are ripped up over night

Oh really? I thought we're ABOUT to find out what it's like to have no allies or business partners? Weird!

>it's gonna take a while to have noticeable effect

Ah, the magic "it's happening but I can't prove it, so trust me bro". Meanwhile, I can point you to tangible metrics showing the world is moving away from the EU to China, meaning the EU will have zero trade with anyone else in short order (trust me it's really happening).