Reminds me of the "what is it with Linux people?" comment from the "Android Open Source and Compatilibility Lead" in the last thread on this topic. There definitely SEEMS to be a firm cultural attitude at Google that they not entangle themselves with "Linux" more than absolutely necessary.
It sounds an awful lot like Google would rather have android be "not Linux" in some fashion, perhaps instead "based on" Linux in the same way that some Disney movies can be said to be "based on a True Story". I hope this is just me being cynical, though.