Honestly, I don't think that's going far enough. That "our vision is that we work as if we are one company" line couldn't be a better basis for an antitrust case if they were literally trying to incriminate themselves.

That line, bereft of context, is being used as if the two companies don’t compete in many many markets. Do you really think that the original context was as broad as the entire company’s operations? Or even the respective phone ecosystems? They clearly compete with each other heavily.

Also, that line may be the only evidence... depending on who said it and in what context, it is very unlikely that a plaintiff would use a single instance like this as the basis for their entire case.

Maybe they aren't competing, but merely simulate competition in many markets. Why isn't the app-store-tax getting lower through heavy competition?

In many cases, it looks like there's some mutual competition-simulation going. Google launches Google+ to pretend Facebook isn't the only social network, Microsoft launches Bing so Google can say "we don't have a monopoly on search", Google finances Firefox to say the same about browsers, Apple creates Apple Maps to pretend Google Maps has competition etc, but they always seem to put in no more than the minimum effort required.

Of course, they could be honestly trying to compete and they just suck at doing those things their competitors do really well. It just looks suspicious, and quotes like that add weight to that impression.

Yes, all capitalism is just a big agreement to channel all the assets to wealthy people. The only one not in on the secret is you.