Oh. No it does not. It is pure speculation about effects not measured.
Yes, it deserves a B.S. award.
We have used a natural gas cook stove as extra heat source in winter for ..well, butane first 5 years, then 15 years of propane. Natural gas after that. I am 77 years old. I have an unvented natural gas fireplace in my den. Slept well there many a night.
I will admit the fireplace did produce strong fumes when I first tried it. I simply took it apart and drilled an extra air hole in the gas-air mixing line. 20 years ago and no problems.
Indicate? Could?
When did the scientific method die? Was it in the Carter, Clinton, or Obama era?