He is good. Work to be done, but a lot of talent there. A lot. Wahab is class in T20's. Pakistan have an outstanding bowling attack. One of the best in the world. Imad is so underrated. Shadab is another class act.
Azam
Zaman
Ali
Malik
Nazir/Rizwan/Sarfraz
Iftikhar
Shadab
Imad
Wahab
Amir
Shaheen
This should be the side groomed. I would 100% give Rohail Nazir a look in and I am not saying this because Haider Ali worked. You have 3 world cups in 3 years and you would want the same squad playing them. I've never seen Khushdil Shah so I cannot comment.
Malik apart, that lineup is fine. I would play another bowler/bowling all-rounder in place of Malik given Shadab's improvement with the bat.