Certainly not the the best ton by a visiting Pakistan team - not even close! because it was on a slow surface against a depleted England attack (without Anderson and Stokes). As correctly mentioned by the informed on here it is indeed ranked very low. I mean how can you ignore Younis Khan's knock in that series as well seriously?
I can come up with at least 10 knocks from Pakistani batsmen that are superior (in no particular order):
1. Inzy - 148 @ Lord's, 1996
2. Younis Khan - 218 @ Oval, 2016
3. Inzy - 114 @ Old Trafford, 2001
4. Zaheer Abbas - 274 @ Edgbaston, 1971
5. Zaheer Abbas - 240 @ Oval, 1974
6. Aamer Sohail - 205 @ Old Trafford, 1992
7. Moyo - 192 @ Headingly, 2006
8. Moyo - 202 @ Lords, 2006
9. Javed Miandad - 260 @ Oval, 1987
10. Saeed Anwar - 176 @ Oval, 1996
There are many more I could add to the list.