I was thinking that this is mainly a US thing and then saw that the article talks about the US. Android is still more common in the rest of the world.
The article contradicts the unspecified headline in the first sentence: “It’s no secret that Android is the most-used operating system in the world, a title it first earned after surpassing Windows in 2017.”
I do see a difference between Firefox on a Pixel 4a and Safari on an iPhone 13. The iPhone loads a webpage in less than a second whereas Firefox needs 2-4 seconds for the same webpage. I still use Firefox though as it is better in every other aspect.