I think the lede is missing. Arguing they are uneconomic with Solar and PV reducing electricity costs against gas is counterfactual. So, assuming its both counterfactual and true, what alternative is proposed, which is not "keep gas"

If the alternative is direct electric heating, electric hot water storage systems and electrically heated radiators and sub-floor heating say so.

(unless I have completely misread the article it demolishes some myths about heat pumps but winds up saying their LCOE may be good compared to gas but capital cost kills them economically)