That cup isn't threaded but needs removed first before pulling the flywheel,likely broke the bottom out of the cup. The cup has a locator pin on the bottom which fits in a hole on the flywheel and can be a little stubborn to get off ! Try to get the piece out if that is what happened and soak the keyway with some penetrant , there should be two threaded holes for puller in flywheel that likely are crusted over with dirt ! good luck
