As a former student of the author, I don't think he's saying they should be able to avoid jurisdiction. I think he was musing on whether it would even be possible under this new Ninth Circuit framework/test. He concludes it's unlikely, and hence for Shopify (or any other company putting cookies in browsers) to have any chance of avoiding it, they're going to have to appeal to SCOTUS.
Not at all. I think he rightly concludes that jurisdiction is completely avoidable by geoblocking California.
It is baffling to hear the author ask the question “did Shopify ‘expressly aim an intentional act at California?” And subsequently conclude that Shopify’s entire business model is in doubt if it doesn’t do business in California.