He isn't from the Niazi tribe. He is from the Mughal Khan tribe, I believe. Definitely Mughal family. There are three mughal tribes in the Poonch Jagir (lands which spans across the LOC). They are the douldai, khan Mughal, maldiyal. Both maldiyal and douldai trace lineage from the chughatai Mughal clans that arrived with the Mongol invasions and finally settled with the formation of the Mughal empire (however both the douldai and maldiyal wrote themselves as rajputs in British consensus).
The Mughal Khan find their origin as kamangar meaning bow makers. They weren't soldiers but arms professional tribes and while they claim such descent, other Mughals don't see them as real chughatai since in their view all Mongol families must have landowners lineage which is ofcourse aristocratic rubbish. The Mongol and Turkic brought many people and not everyone got lands, so I am more inclined to believe their story especially considering that they used kamangar for quite a while till the arrival of British. Don't get the khan title though. If they were kamangar, they definitely wouldn't get the Khan jagir title but the Mughal Khan have built their presence in the villages and have formed their family tribes.
However they have as much links to Pathan tribes as the sadozais of Poonch have with sadozais Pathan tribe.