Liberal and Green promises are better. But just as a policy priority for US proxy war on Russia killed (most humanist tax in history of civilization) carbon tax as a result of full global refining capacity for diesel/home heating fuel, meant no possible counter message to well funded oil industry complaints on climate/human sustainability, there are practical political priority constraints on EVs in Canada.
Key for EVs is Honda, and its production plans. Honda Japan suggested sacrifice even as Honda Canada denies. Just as Trump's attempt to destroy big 3 auto makers can be a pro Tesla move, the big 3 and their unions, are happy to destroy Tesla and EV mandate, as many traditional auto jobs go away with EVs, and big 3, though they announce attractive models, have yet to actually produce high volumes.
The easiest move to support big 3 EV production in Canada is allowing tariff free batteries from China, and letting them partner with Chinese battery suppliers to even with 25% tariffs (on just battery), provide huge export market to US. Honda should still be able to compete, but speed of progress from Honda is key factor on jumping the gun on China relations.
Importing EVs from other US colonies would hurt big 3. DoFo's proposal to have US-Canada only NAFTA auto deal is screwing over Mexico, where big 3 EVs are made. Trudeau's designation of Mexican Cartels as State sponsored terrorists is also throwing Mexico under the bus (authorizes US to treat Mexico like Yemen) the same way that sycophancy olympics will motivate other US colonies to throw Canada under the bus.
Promises on EVs are certain to be a lower priority than strengthening domestic auto sector which is currently light on EV production. Other than better integration with China as a solution, the key to removing US extortion is to make clear that the US will never sell another car in Canada if Trump is successful in destroying or diminishing Canadian auto production. US has a slight trade surplus in Autos with Canada, and so Trump's dementia will cause a drop in US employment and affordability of US cars.