"The options icon is three vertical dots, rather than the three horizontal dots favored by Apple."
You could also argue that for someone using Google products, it makes sense that they look and behave roughly the same no matter which platform you're on. The interface is the brand [0] so why try to make it look like an Apple product when it's not?
Or maybe the article is right, maybe cognitive workload increases when the options icon is suddenly drawn using vertical dots instead of horizontal ones. I could only find three arguments in the text. One: it's what Microsoft did in the 90's. Two: Users deserve consistency. Three: (implicit) I bought an iPhone because I like the design, and now Google is forcing me to use their apps which doesn't look AS NICE! :)
[0]: https://ia.net/know-how/the-interface-of-a-cheeseburger