A good article. A few things though...
That $80,000 USD median income. That is the equivalent of $108,0000 CDN (as compared to Vancouver's $60,000). So almost twice the income.
As Kerry Gold points out Zillow is making big money from China so one might be forgiven for doubting their assessment that foreign money is not a factor in rising prices and put more faith in the other sources.
And if activity/prices really didn't rise in Seattle perhaps it would be worth looking at Whatcom County, specifically just south of the border, where rising activity from China was reported in the local media after the BC tax took effect. Much cheaper land. Just as good infrastructure. Close to Vancouver and Seattle.
The tax problems cited certainly need to be addressed.