Poached is indeed a bad term. But from what I understood, they have not employed any new worker, they just gave them visas, most should be still working for US companies, and are using this as an escape plan in case their US Visas are not extended to avoid returning to their original country.
A better way to phrase it is "Canada has employed 10k people in America in 48 hours". But that isn't worthy of being pointlessly outraged by everyday language.
Not even employed. Just "10K H1b workers applied for the permit in 48 hours". No guarantee that they will follow through with the application or have jobs.
A better way to phrase it is "Canada has employed 10k American tech workers in 48 hours." But that doesn't sound nearly as nefarious.