It’s not so remote a possibility as you might think.
Visible Eucharistic miracles are not common occurrences - but they do happen. They’re of a piece with the titanic miracle of the Eucharist itself.
We have the unutterable privilege of receiving the Body, Blood, Soul and Divinity of our Savior. Sometimes Christ chooses to make this existing miracle visible.
I hope they dealt properly with the piece they analyzed.