It's not a bunt unless the batter makes some additional movement (okay -- there's a possibility that the ball is so close to the bat that the batter thinks it will hit the bat, and so doesn't move it, but that's very unlikely).
Look at it like this: Suppose you are right, and just holding the bat out makes it an offer. On another pitch, the batter holds the bat out, but then pulls it back. You'd call this a ball, right? But how can it be -- by your logic the batter already offered by putting the bat out, and you can't "undo" a swing. Since pulling the bat back leads to "no swing", just putting the bat out must also be "no swing"
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