Not defending Qari Waheed Zafar here, but where is your reference for him being Deobandi? Because the Qasmi appellation in Pakistan doesn't always apply to someone who is Deobandi or from Nanotwi's lineage.
For example,
Shaykh Ghulam Rasool Qasmi sahab (hafizahullah ta'ala) uses the 'Qasmi' appellation since he's bay'at to
Pir Muhammad Qasim Mashori (Larkana, Sindh)
Qari Waheed's biography states his family migrated from UP, India, so there's definitely suspicion there.
As an aside, I came across
this video from 2022 where he mentions the naat he recited which got him entry into the roza sharif. [Longer video with his explanation of Qaseedah Burdah
here]. Interestingly from this video, you can see that he now has a beard (albeit not fist length, but at least better than clean shaven) and the gumbad sharif of AlaHazrat's mazaar in the back. Not saying any of this is proof for his 'qabooliyat' or Sunniyyat, just an observation. Also, if anyone on this forum is in Pakistan and can contact him to find out about his aqeedah, that would put some of this to rest. Maybe he became Sunni or never was Deobandi?
Allahu 'alam