This is absolutely disingenuous. Google routinely refers to 'Android activations', and the success of Android in public communications. This use is clearly not confined to carefully referring to the AOSP.
If as you say, Google intended to have 'Android' mean the AOSP at one point, and it has stopped trying for that definition now because it failed to make the distinction to the public, then that only strengthens the point that Google (and you) know that what people think of as 'Android' is not open, and so are knowingly exploiting the ambiguity between 'Android' and the AOSP when you perpetuate that idea.
If as you say, Google intended to have 'Android' mean the AOSP at one point, and it has stopped trying for that definition now because it failed to make the distinction to the public, then that only strengthens the point that Google (and you) know that what people think of as 'Android' is not open, and so are knowingly exploiting the ambiguity between 'Android' and the AOSP when you perpetuate that idea.