That's not how I read it. And I've also heard of others who have used their Canadian jobs on the I-864 if they are keeping their employment once they move to the US. According to the instructions, and to advice I've received in other forums here at VJ, you must have proof you are maintaining your employment after you move (contract, letter, etc.) You cannot use your Canadian job on the I-864 if you are not able to keep your job when you move.
Also, we may want to check the new Tax Guide in Canada for the 2020 tax year. The CRA has implemented a whole bunch of new regulations and categories for "non-resident" Canadians who live in another country while working in Canada. These regulations are all a result of COVID and the reality of the new working world.
