To be clear, I'm an American, I was born in the US and I live in the US. I think that the US leaders should stop with the stupid tariffs and stop threatening to annex Canada and Greenland.
I've never been so deeply ashamed of my country as now, and primarily not because of Trump, but because either (a) so many people just actively cheer this on (like before he went on his tirade most MAGA people probably wouldn't have a bad thought at all about Canadians) or (b) the people that obviously know how stupid this all is are being quiet in the stereotypical "for evil to flourish, it only requires good men to do nothing" way.
That said, it seems like the figure is simply some estimate from an analytics/forecasting shop, not authoritative data. Reminds me of folks who (mis-)predict Apple revenues based on component manufacturer's output reduction.
I call bullshit on the OAG estimate. We'll see...