If I may, because this is an interesting point –
There is a theory that the image on the Shroud was created by irradiating it with high-energy radiation (gamma rays). I.e., the Christ’s body had emitted gamma rays in process, and that gamma radiation imprinted the image on the Shroud. Actually, it looks like someone has verified this by injecting himself with a radioactive isotope, wrapping in a cloth and using a gamma-sensitive detector to photograph himself:
freechristianteaching.org/modules/smartsection/item.php?itemid=159
If that is true, it would have some very interesting implications.
First of all, the Resurrection would be actually observable: a gamma-sensitive detector would see the event. A human too close to the event would get radiation burns or be outright killed. (No record of injuries of soldiers guarding the tomb… But we don’t know how close they actually were.)
Second, that amount of radiation would break molecular bonds in Jesus’ body. Which means that the resurrected body could not have been physical. I.e. whatever it was, it was definitely not made of the same molecules which formed Jesus’ body.
Also, more to the topic of the thread: there is a confusion between “seeing” and “perceiving”.
“Seeing” involves sight, i.e. photons hitting the photosensitive cells in the retina. If Jesus’ resurrected body was not physical, it would not reflect/emit photons, then he could not be seen (nor recorded by the camera). In this sense, Muller would be correct.
However, it could be possible that such non-phycial body could be
perceived by the minds of his disciples. After all, there is ample evidence od people
perceiving things which are not physically there (Fatima, Medjugorie, etc.). Which would also explain why the resurrected Jesus had no problem going through the closed door etc.
Whether the non-phycal object being
perceived yet
unseen was actually there is a whole different question…