This is a little glib, you dropped "Entirely" because you know multiple first hand accounts are actually worth something. If you want to argue the credibility of those accounts, then please be specific about it.
So you critisize Joel because he worked at Shopify. He pointed that out when he wrote the article.
Let's add here that YOU also worked at Shopify, until recently.
IF we are going to be critical, then let's be complete here.
I actually think there is a lot of validity to the statement made that Shopify is NOT a neutral party here. We can dispute how much Shopify was involved, but to assume "all is unsubstantiated" while not even disclosing one's own work at Shopify, feels super-strange here.