Based on your tone, it seems like you are critical of the article, but your critique is actually what the article is addressing. Specifically, "Effect 2" demonstrates a unique property of "induced demand" that doesn't fit into traditional discussions of supply and demand.
Cooking with natural gas is detrimental to indoor air quality (https://www.vox.com/energy-and-environment/2020/5/7/21247602...), and improving indoor air quality is specifically called out as a motivation for the new restrictions in the article. And as far as natural gas usage patterns, I believe most natural gas is used for heat and hot water, with the amount used for cooking being relatively small.
About 51% of California electricity consumption is from hydro, nuclear, and renewable sources (https://www.energy.ca.gov/data-reports/energy-almanac/califo...). On top of that, many new electric heating systems would probably use heat pumps, which bring in 2-4 times as much heat into the house relative the the amount of electric energy consumed. In combination, that means that even accounting for transmission and generation losses, using electric instead of gas heat in new construction should result in significant savings in carbon emissions.