A false flag, and Dooku doesn't dignify that with a reply, less because he has none but because he does need a second, his frown sharp and disbelieving and said disbelief clear in the Force as answer enough, to process that. A false flag, from the Force? Even more so when they are at war?
And then Kenobi speaks of Yan's dedication, and he doesn't look away, but the tendency is there, for a brief second. He's not one who receives flattery well and it's taken worse when it doesn't feel like flattery. But then again, Dooku is always better when he's somewhere in an official reason, and he's aware, and has long been, that he does not have the kindest character. Of course he's loyal to Sifo-Dyas, how could he not be?
But that all pales when asked a question, then another, that he doesn't know an answer for. And so he stills, for a moment, sets his feelings aside and releases them into the Force, and goes for the easiest one first.
"If I remember this when I get home, I find it unlikely the timeline will remain as it has, so it would stand to reason it either splits, or the Force makes me forget." He says, in the end. "But we cannot be certain, and I suppose we might only find out if I come face to face with the man I become." He adds, dryly, before his tone turns more circumspect. "But it does not feel like the best time to appear, no." He will concede.
And then, after a moment, he speaks again.
"I don't yet know the man I become. I cannot judge what could have changed." He settles for.
And he will not say he might have his reasons, not when he knows what little he knows.