On refuting the allegation that Shah Isma’il Shahid denied the preservation of the body of the Prophet (sallAllahu ‘alayhi wasallam), see here.
The following couplet written by Shah Isma’il Shahid in his Mathnawi Silk e Nur (on praise of the Prophet – sallAllahu ‘alayhi wasallam) should clear all doubts about his views regarding the preservation of the body of the Prophet (sallAllahu ‘alayhi wasallam)
ان آنکھوں سے ہڑ چند وہ جسم پاک بظاہر ہوا مختفی زیر خاک
ولے نور ان کا ہے قائم مقام کہ ہر پاک دل میں ہے ان کا مقام
“Although seemingly that pure body is hidden from these eyes beneath the earth,
Nonetheless, its light stands in its place, as there is a place for it in every sound heart.”
(Mathnawi Silk e Nur, quoted in Shah Isma’il Muhaddith Dehlawi by ‘Allamah Khalid Mahmud, p. 132)
The verses are clear that the pure body remains beneath the earth even today.