In Pakistan's constitution, it's prerogative of PM to appoint every state official, incl. army chief and be able to micro manage institutions, using his hand picked advisors and ministers.
Imran Khan is Pakistan's most authoritative PM ever in history of Pakistan, and it's funny how he claim to be ignorant of the things that goes around in Pakistan, but Iran grappling in COVID was a major international news, but no one dare to stop citizen, from going into a death trap... whatever the reason may be but remember..... Chengez Khan is known as a conquer, but only he and his commanders are credited for the killing of the people involved in process, not the soldiers who actually executed the killing.
Imran Khan had and still have all the authority to publicize the CCTV video of Taftan border immigration and expose the real mafia behind the conspiracy.
There must be investigation, and the point i raised that goes against him is that, he did not allowed Pakistani students from China to come back, so he was aware of situations and took practical actions in cases, that suited Indian cold start doctrine.
Fact: Just before delta variant spread in Pakistan, Wahga border saw spike in travel activity... why travelers from India were not asked for quarantine is another case, which shall be investigated.
Even today, Imran Khan's Pakistan consider Iran and India as low risk country for COVID pandemic, while rest of the world think opposite, but of course according to your analogy it's not Imran Khan's doing, but i refuse to accept this excuse, considering he always know, if his political opponents are travelling out of Pakistan and is able to issue travel ban in very timely manner.