Alright let's analyse properly
First off the team Shadab got was not a nothing team. Saim and Haris is a much better opening combo than Babar and Riz, Tayab and Azam in the middle is much better than Ifti and Shan/ any other tom dick or Harry, Imad is a much better AR than Nawaz and Ishanullah and Zaman are on par with Rauf and Naseem in T20Is
As
@topspin mentioned Shadab would under bowl Imad throughout that series and that was the main reason for our loss.
So what does that display? It shows that Shadab as captain is willing to sacrifice results in order to maintain his position in the team similar to how Babar stat pads.
You can see the same today. Usama has been bowling well and yet Shadab is giving himself max overs in order to guarantee his place in the side (already guaranteed)
Also it's pointless comparing today's game with ours vs NZ. The pitch is much slower and supportive to spinners and skiddy bowlers like Wasim Jr and Hassan, yet despite that Australia are on course for 300+
Like I always say domestics and PSL are the best barometer to judge captaincy and the results from both have shown that Shadab is a serial non performer as captain who has failed to get Islamabad (who had won two PSL's under Misbah of all people) to win any tournaments