Meh... article is pushed by special interest groups. Their concerns could be addressed very quickly by raising their employees salaries. Especially since vast majority of companies sell services to the US, and get more CADs than before with the current exchange rate.
The Vancouver economy is not 100% tech, there are many, many businesses (logistics, banking, retail, etc.) that have no exports to the US. Can I ask where you are getting your data?
Thats true, but did you read the article though? It addresses tech industry in several paragraphs at the very beginning. The older tech industries might be CAD-orientied, but any new startup aspires to be global and charges in USD.