> The above is correct. Additionally, they even mention natural gas as a viable alternative in the abstract:

It isn't, and you clearly failed to read the paper because you're oblivious to its context. The "alternative" was open-flame coal and wood stoves, as well as querosene stoves, which cause extreme levels of indoor pollution and health hazard and are in widespread use in underdeveloped nations.

Natural gas stoves pollute less than open-flame coal and wood stoves, yes, and are therefore a preferable alternative. However, unlike your clueless claim, this does not mean that gas stoves do not lose a health hazard, or that electrical stoves are not far preferable. The WHO report refutes the bullshit claim that gas stoves don't present a health hazard due to the type and levels of indoor air pollution they create.