The whole article is a mishmash of different articles. Some of the articles are citing more articles that are citing studies. Some of the studies they're citing are kind of bullshit some of their studies they're citing are reasonable and realistic.

The takeaway from reading the rats nest of science is that natural gas and propane do not burn clean enough to just be openly burned inside without proper venting. And it's not just the benzene there's a lot of volatile organics that come off of that. There's a lot of correlation and conjecture in there. Even the peer-reviewed study they're talking about is a meta study review, The biases get pretty muddy in that stuff.

Now this also isn't to say that the gas company are saints and doing the right thing for the consumer. Gas providers are going to lie, cheat, steal, and spend as much money as they reasonably can to protect their business and they honestly don't give a s*** about the climate or people's health they're really just there to make money.

Proper electric stoves are cleaner, faster and more efficient. I don't them uncomfortable to cook on, but I have to admit it's probably mainly my unfamiliarity with timing and temperatures associated with electric.