Firstly the author is taking things too far by comparing the number of Android phones with tablets. Amazon doesn't have an Android phone. But they will most likely have the best selling Android tablet. And the argument is they may own the Android tablet market which gives them tremendous leverage.
"Google does not care about facilitating app sales because they can make 15-30x the money from search."
Here's he's taking the overall figure for all of Google's search revenue and just applying it to Android. That's not a fair comparison to app revenue. And assuming that Search Revenue > App Revenue, therefore Google does not care.
"Google clearly believes that the web will win out in the long term and native apps are a stop-gap, "
... Yeah, that's a big assumption based on a world before native apps.
"Amazon does not care about app sales... Kindle Fire is about selling more digital content and facilitating e-commerce"
Except apps are digital content and are a huge growth market.