You do realize you’re not looking at the “incorruptible” corpse of Bernadette in that photo right? The face and hands are wax facsimiles which were used to covered the decaying corpse underneath.
One might as well call the pieces in Madame Tussaud’s “incorruptibles”.
And you know this because you were there? Or maybe you're omniscient?
Here is the testimonial from an eyewitness to her exhumation:
Doctors were at hand during these exhumations as well. In the exhumation of Bernadette the doctor, Doctor Jourdan, a surgeon, wrote this about the exhumation experience:"The coffin was opened in the presence of the Bishop of Nevers, the mayors of the town several canons and ourselves. We noticed no smell. The body was clothed in the habit of Bernadette's order. The habit was damp. Only the face, hands and forearms were uncovered. The head was tilted to the left. The face was dull white. The mouth was open slightly and it could be seen that the teeth were still in place. The hands, which were crossed upon the breast, were perfectly preserved, as were the nails. The hands still held a rusting Rosary. The veins on the forearms stood out." (Doctor Jourdan, 1909).