I mean, McJob. If you REALLY want to get technical like that, then it would be 0 A presses. Pressing is an action, not a state. The action itself is just pushing the button in. What he's doing is holding it down. It's technically not a press at all. Just a release.
However, the reason he considers it 'half' an A press is because he's carrying over the input from a previous time where he had to press A, but not release it. Calling them both 'half a press' to total 1 press isn't really a problem.