Do you think the intent of the post is to complain about SDK compatibility ? :)
[1]http://en.wikipedia.org/wiki/Hanlon's_razorThe larger implication (not withstanding using documented or undocumented API) is violation of general assumption that Chromecast will be open and idie friendly than the Apple TV.
Even if the OP had used a documented API, the developer warning is clear that any and all API can be changed.
I thought Google made it clear from the beginning that this was intended to be a beta release until testing was done. Looking at Reddit I was shocked to see the number of people who think Google is trying to force them into buying from the Play Store.