The comment you’re responding to literally does not mention FF.

Does it need to? That's the alternative we're talking about, whether it's mentioned specifically or not.

Wind and solar are great and have become so good in the past decade that they're more cost effective than everything else, but they still aren't applicable everywhere, most often due to real estate requirements. Nuclear reactors are bulky too, but nothing compared to the amount of space you need for solar arrays or wind turbines to generate an equivalent amount of electricity. For the places where wind and solar can't fit, it's fossil fuels or nuclear.