In places like Ontario, which admittedly is the most populous province by far, the purchaser for the government-run liquor stores (LCBO) decided not to buy US alcohol, and the LCBO decided not to sell its remaining stock.
In some provinces, US booze never went away. Here in Alberta I've never not been able to buy US wine or bourbon. Of course, I won't buy it, and I've found some Canadian whiskies I like that are new to me, like Bearface, Red Bank, and Gooderham and Worts. And at dive bars, I've started ordering a Jameson and soda.
Just from the text, these powers appear quite broad.
[1] https://www.law.cornell.edu/uscode/text/19/1338#:~:text=Prio... §338 of the Act was apparently codified as § 1388
It's now clear that trade deals with the U.S. will not be honoured, so why should Canada continue granting the U.S. concession after concession? The Carney government needs to go silent and let Trump hang himself in the midterms.
As for myself, I'll never drink Kentucky bourbon again so long as I live, whether that corn swill is on Canadian shelves or not.