Wearing a bandage on his right forearm that masked the most serious scars of his F1 career-ending rally crash of 19 months ago, Italian reports said the Pole took his Subaru Impreza to victory in all four time-trials.
But Brazil's Agencia Estado said the 27-year-old's first real public appearance since his crash also revealed the true extent of Kubica's new limitations.
The former BMW and Renault driver "does not have full mobility of his right arm", said the report.
Indeed, footage of the minor Italian rally shows that while Kubica is able to steer a car with both hands, the movement in his right arm and hand is obviously limited.
He held the winning trophy and champagne aloft, and drank water from a bottle, only with his left arm.