Countries still use a lot of not-electricity for industry, transportation, building heating and cooling, etc, and for that, they use fossil fuels. The substitution method shows you how many fossil fuels are used for those applications in TWh terms, but makes no judgment about whether we actually would or could use electricity instead.
Indeed, for many of those things, there simply does not yet exist an cost-effective electrified subsitute, so it would be impossible for renewables to perform that work (in any country).