The photo in question, dubious as it is, DOES NOT show the Blessed Mother on a cross. It shows what appears to be a woman touching a cross with her hand on her breast. NOTHING in the photos suggests that she is being crucified, so the phrase “on the cross” is patently FALSE.
I love the subtle touch of the dude claiming Mary is on the cross doesn’t even actually know how to link to it. Although the far more likely explanation is bringing the picture to the forum would instantly prove his “interpretation” of the photo into serious question, and by association, the rest of his fantasy propaganda.