The tweet is FUD... He missed the most important part.. How do you install this on a Droid or most other
If you are compiling your own operating systems, maybe you should get a developer phone? You can install anything you want on those.
You need to root it just like you do to jailbreak a iPhone.
That's FUD. If your phone is locked down by your carrier or manufacturer, yes you'd need to root it. However, that's where similarities stop - i.e. try compiling your own version of iOS - that's right, you can't, it's NOT open source. That's the difference.
Android devices are far from open.
Most are locked down. Dev phones are not. Most that are locked down are easily rooted.
The big difference, again, is the operating system, not a device. Anyone - i.e. any startup tech company - can take Android source code and start making and selling their own cool devices based on it. That's the advantage of it being open source.