Thank you for the link to that PDF. If you read it, you will find that it says that your friend, with his over 10 years of specialized training and real world experience, is wrong.I would call it a professional opinion based on over 10 years of specialized training and real world experience. Here is a PDF on how to make your used refrigerant oil EPA compliant for burning. http://www.p2pays.org/ref/13/12346.pdf
According to the PDF you referenced, refrigerant oil that has been removed from refrigeration units, and hasn't been specially processed will contain in excess of the EPA's maximum amount of freon (4000ppm) allowed for recycling, burning, or other disposal.
I'm glad that we finally know that answer.
It still isn't clear whether the MF engine will consume the freon and the heat generated phosgene nerve gas, or whether it will just blow it out its exhaust pipe.
-Chuck