True. A JVM and a standards compliant browser from scratch are significant achievements and I am very skeptical. The last quote mentions that they won't open source it because it copies those things (which is not bad, but a far cry from "completely independently developed"). I think they won't open source it because non-corporate adoption is less important than the state-secret mentality.

But it shouldn't matter, once released surely engineers can disassemble the binaries or check implementation quirks of Oracle/Google tech implementations to know whether they are fresh implementations.

Edit: Ok, a JVM alone is not that significant, but re-building the Java standard libs (harmony-style) and making the JVM high performing (dalvik-style) is.