Sorry S-works this paper is complete rubbish. There are multiple things wrong with it, but it doesnt have any evidence about CO2 as the CO2 wasnt measured. We are talking about a barrier mask not the use of compressed gases. I am happy to discuss your other claims but this is not the time or place. People need clear advice which is that a FFP3 mask does not significantly effect gas exchange and is safe.
If you would like to tell me how to determine whether someone in my aircraft has the virus so they dont need a mask let alone how you prevent infected people getting airside, I will make you a rich man because the entire medical system in the Western World is struggling to achieve this so we can restart safe elective surgery and the airlines are folding because they have failed to do so. I apologise for disputing your claims but safety demands clear advice based on science.