I said in a recent posting

It's now time for me to eat a bit of crow. If I were RJV, I would blow huge clouds of smoke to try to conceal the fact that I had erred. I'm not RJV, so I will simply say that in making the statement I've quoted above I misremembered some details.
The preposterous assertion RJV made was not that he baby had said "I can do it, too". The preposterous implication he made was that the baby had spoken a different full sentence.

Let me also say that in the discussion I've referred to, I made a rather serious error in saying that a voice I heard was that of my daughter. I even expressed indignation that anyone would doubt my ability to recognize my daughter's voice. I was later embarrassed to be told that my daughter wasn't even present, and the statement that Valentine heard and attributed to someone on-screen was actually made by the baby's mother, off-screen. My daughter's voice and that of the baby's mother (one of my granddaughters) are evidently quite similar.
So now I've confessed, and I must say it sorta hurt to do so.
But the essential points are unchanged. Valentine imagined that he saw things in a movie clip that weren't there. He imagined that the baby spoke a complete sentence that she did not speak. He attempted to prove something about lip rounding based on imagining that a person on screen had said something she didn't say. He blew enormous clouds of smoke (See Message-ID: (Email Removed)) in a futile attempt to hide his silliness.
I apologize for readers for bringing up this topic again when I sorta promised I wouldn't. I'll try to not mention it again unless I'm forced to.
Let Valentine blow all the smoke he wants to; just remember that that stuff that's running out of his ears isn't wax.

It seems pretty clear to me that Richard means that your "ah" sounds like a vowel that, if he himself said it, he would prefer to spell as "aw" rather than as "ah". (It also seems pretty clear to me that when he says "we" and "us" in the quotes sentence, he means 'I' and 'me'.)

It's not true at all that he's saying nothing. He's not giving information of the kind you may want to be given (namely, phonetic description of a particular vowel in your speech), but he is giving nonzero information (namely, the way his own ear interprets a particular vowel in your speech).

-Aaron J. Dinkin
Dr. Whom

But I think it does have some useful meaning to the community of CINC AmE speakers. I think if you were CINC you'd understand. Everyone who's a CINC AmE knows there's an "ah" and there's an "aw", and that these concepts refer to a range of sounds, including certain ideal or preferred subsets.