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Those links appear to be about ads within apps, not on web pages.

They can often be annoying, but that's different than interstitials on top of a mobile web site, right?

Yes, in-app is a very different environment from mobile web.

Also they only want to stop full page ads pushing to download the app, not any other full page ad.

As I understood the article, they're not discouraging all full page interstitial ads, just the ones which tout the mobile app of the website itself on first screen load.

As techchrunch pointed out, Google doesn't monetize iOS apps very well. Left and right hands are very much in sync.