Paratici didn't land Conte, Spurs landed Conte. Conte was available in the summer but didn't come because Levy wouldn't give him what he wanted. Paratici was here then and couldn't land him. What changed was Levy lying to Conte saying he will back and give him what he wants, not anything that Paratici did.
We were not unlucky in not getting a back-up striker, we were not unlucky in letting Bale and all his goals leave and not bringing in a single player that can score goals. We were not unlucky in not bringing in a single player that can effectively pass a ball. We were not unlucky in not bringing in massive upgrades in the MF that is needed.
Parartici also made terrible moves at Juve once Marotta left, that is not bad luck but terrible decision making from him.