This is your same argument. It does not address my counter argument.
Your counter argument does not provide any rationale for altering or contradicting a single point in my argument. Therefore there is nothing to address.
Specifically:
My argument says that the OB possesses infallible knowledge of my choice, before I make the choice. Your counter argument... agrees with that, as it must for "omniscience" to have anything like its conventional meaning.
My argument says that my acting contrary to the OB's knowledge would create a logical contradiction. Your counter argument does not address that claim.
My argument claims that more than a single choice of action being possible, at a time prior to the choice, is a necessary condition for free will. Your counter argument does not address that claim.
My argument claims that, because actions that create a logical contradiction are not possible, more than a single choice is not possible at any time prior to the choice. Your counter argument doesn't address that claim, other than to contradict it without any applicable rationale.
My argument claims that the premise of an OB therefore renders impossible something that must be possible for free will to exist. Therefore it necessarily rules out free will. Your counter argument doesn't address that claim, other than to contradict it without any applicable rationale.
You do not get to declare your counter argument conclusive, without a rationale for how it applies to or affects my argument. Anyone can say, "the earth revolves around the sun, therefore your argument is false; to defeat my counter argument, you must prove the earth doesn't revolve around the sun." But unless you can explain what specific part of the chain of reasoning of the original argument is contradicted by the earth revolving around the sun, such a counter argument can be dismissed without further rationale as irrelevant.
Respectfully,
Myriad