Those are 'voting places' reporting on the Elections Alberta site, and not polling stations. There are frequently multiple polls at a 'voting place.'
In 2019, there were 1,906,366 total ballots cast (including spoiled ballots.) Right now the total count is around 1.725 million including spoiled ballots. So, total votes will likely fall just short of 2019.
haha thanks i'm not sure if the CBC site is misleading or if I'm somehow so dense that I never managed to pick up on this distinction in the 17 years I've been following Canadian elections
regardless it sounds like I should probably switch over to using the Elections Alberta site