Last I checked, here in BC the wage for a senior programmer typically ranged between 80 and 150, Canadian.

Taking a 20% discount on a SV senior salary, in American dollars, would likely be a significant raise.

150 seems high in my experience in Vancouver. Are you able to comment on which companies pay towards that end of the range? I guess this would be Amazon, Microsoft, Apple?

150 is entry level for Amazon Vancouver now. These would have to be local companies

I know for certain that SAP, Amazon and Microsoft will pay that much for a senior developer.

The main difference is no RSUs vs. $200-500k/year RSUs.

My new US based employer laughed when he saw what I was making in Canada. “So this will be quite a nice jump for you?” Yes. Yes it was.

The US company I started working for during the pandemic is paying me US rates, in USD, so I wouldn't call it an "assumption" just because you accepted a job in which you're getting paid 20% less.

Are they paying SV rates with RSU though as FB and Google are definitely paying noticeably less overall as that was the point of the OP?

The person I am directly responding to was disputing the idea that employers are paying US rates in Canada at all ("That’s quite an assumption that US companies are paying US rates in Canada."), not SV rates specifically. Please don't try to shift the goal posts.

20% less might still be over double local rates.

Which is probably still >50% higher than Canadian companies pay with exchange rates factored in.