Comment
Had Belladonna taken the first trick with the ♠10 he would also have made 3 tricks in that suit.
The really important thing Belladonna achieved with his deception play was to keep West's interest and focus on the ♠ suit, avoiding a switch to his very weak ♣ suit.
It also kept his two entries to Dummy (♣A and ♥10) intact until he needed them.