This is bull.
The REAl Mandylion is in Spain, not in Genoa, and its no picture. Its the actual "handerchief" which wrapped the head of Christ after the Crucifixtion. It has been connected with the Shroud of Turin, which is no fake, but the real burial shroud of Christ.
Belief in Christ and resurrection does not rest on the authenticity of any earthly evidence, but the existence of these relics both enrages and enfurates the anti-Christians and atheists, especially their effete and degenerate western intellectuals who only believe in the conceit of their own knowledge.