Note the avherald report is the DGCA letter with a COMPANY note added.
The COMPANY states the drop in visibility made a "safe landing impossible".
NO!
It made a landing at or above the stated minimas unlikely (actual vis at minima Vs stated minima 5 minutes earlier) but no reason why a SAFE landing wouldn't have been achieved from a stable ILS approach.
The decision to leave Lucknow having already declared MAYDAY FUEL a separate issue for consideration.