What exactly do you think transubstantiation is? What part of this story do you think tends to establish your claim that transubstatiation did not take place?
I would say that the "fact" that the consecrated host is now being surrounded by and eaten by mold and bacteria would tend to prove that it is not, "in fact", God.
Perhaps it is just the appearance of mold and bacteria? Or is it REALLY mold and bacteria that have overcome and are now consuming the host?
Perhaps the mold, and natural decay?
The psamlist stated that "the holy one would not suffer decay." Yet consistently this wafer that is the actual body and blood, decays. why is that?