The fact that he uses phone prices based on the carrier subsidy of $199 and $299 to make his point when those phones were actually $649 or more to buy unsubsidized and everyone was just paying the additional price in the monthly phone bill was enough to tell me the article wasn't serious about actually looking at Apple's future, but more about getting clicks.
He also uses $1,149 as the cheapest phone option (but that is for the iPhone Xs Max) and he completely ignores the price points of the iPhone X and the iPhone Xr.
Also, apples service revenue growth continues to be pretty big and important piece of the future. He is right that sales numbers are going to decrease and that should cause concern, but active users is still incredibly high and will only continue to push revenue (18% of revenue in August of 2018).