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What happens if a T comes on the turn or river?
And aren't these 3 outs the same 3 outs the Ax player has of getting his x?
And aren't there more x's below T than above T if neither T or x comes or if both x and T come?

So I would say AT is still a pretty good hand HU, even when you know the other player has an A.

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If a T comes on river you are probably good, of course. But I don't think this will happen enough to negate what was already stated.

If neither player improves after the flop, then you can assume that you are probably good b/c T is "better than average".

If you don't improve, however, you cannot be certain whether or not he improved. And if he didn't, was his kicker outranked by yours to begin with?

If your opponent TOLD you he held an ace, and the board came as such, then chances are you lose.