It is right to pray Allah with the intermediation of any pious man e.g. ?O Allah! Fulfil my need with the waseelah of so and so pious man!? But, the sentence mentioned in the question is not right; neither is it proved to have such belief.
Ahlus Sunnah will be one who will have beliefs according to the Ahlus Sunnah wal Jama?ah. We people of Deoband believe in the same, al-hamdulillah.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband