1. I'll admit ignorance that I didn't watch the whole thing but

While it is known that diesel fuel combustion engines produce much lower concentrations of carbon monoxide (CO) than gasoline engines, these emissions could certainly generate lethal ambient concentrations given a sufficient amount of time in an enclosed space and under suitable environmental conditions. https://pubmed.ncbi.nlm.nih.gov/18643868/

2. They might have used gasoline engines. While I don't believe Nazis "made modifications" to their engines just for killing jews, acting like you could just breathe in diesel exhaust for 24hrs+ in a tight space just makes you look dumb and helps the big Jew lie imo. Calling out the liars is good but when you tip over to the side of just disbelieving them all without evidence (and yes, the burden of proof should be on them but unfortunately our society has lived with this lie too long), then you just feed them rhetoric that they can use as justification for their BS anti-semite laws.