"Prions are misfolded proteins with the ability to transmit their misfolded shape onto normal variants of the same protein." https://en.wikipedia.org/wiki/Prion

"any of several pathogenic, transmissible forms of the core of prion protein that cause a group of degenerative diseases of the nervous system known as prion diseases. Prions have a structure different from that of normal prion protein, lack detectable nucleic acid, and do not elicit an immune response." https://medical-dictionary.thefreedictionary.com/prion

"prion, an abnormal form of a normally harmless protein found in the brain that is responsible for a variety of fatal neurodegenerative diseases" https://www.britannica.com/science/prion-infectious-agent

You are doing an appeal to authority fallacy using someone else's credentials that are weaker than mine on this topic. Do you have Dr. M's statement? Do you have any sources that can be shared for your statement? As I stated earlier, you might be getting confused on a small detail.