I can't read urdu, but I am assuming that the point being made is that Mig21 has a very poor safety record and therefore it will be dangerous for Indian Air Force to deliver or carry such weapons?
-------------------------------------------------------------------------------------------------------------------------------------------------------
Image from the above linked article:
1. This is the image of Mig21.
2. Mig 21 is not equipped to carry nuclear weapons.
Indian Air Force uses Mirage's and Su-30's for this purpose.