Backhand topspin Like Liam Pitchford

Hi i have a question about the backhand topspin of Liam Pitchford. Does he use his forearm and wrist simountenously i mean its Not Like First forearm and than wrist at the ball contact IT feels Like for me He IS using His forearm and wrist simountenously to Beginn the stroke. And also do you think If i want to play a similar backhand topspin like him i dont have to Open my Angel more and than Go Forward i mean i Hear i should Not Copy this exact AS the pros i could also Just start with a slightly Open Angel and Just Finish in the Triangel Motion with His technique ?