This is disingenuous on Google's part, given how disk encryption has been defacto on the iPhone for 5 years now.
Then there's the whole drastic performance degradation on Android whenever disk encryption has been attempted. [2] this whole article is just PR - encryption on Android is terrible by 2017 standards.
[1]: http://bit.ly/2yCPkgR [2]: http://bit.ly/2AGjVdZ