The article speaks about advocacy for nuclear energy. Which is not a fossil fuel.
But then the author suddenly transitions to fossil fuel advocacy. By and large pushing the narrative that, because growing renewable energy deployments have not significantly curtailed the
GLOBAL carbon intensity of energy production, renewables are not helping even at the
REGIONAL level.
However, this chart clearly shows what's actually going on. In
THE WORLD.

Electricity generation in all these regions have increased. However if you look, then it is easy to see that there's a marked difference in the trends between the US and EU, ultra large historical emitters. Vs the rest of the world - Especially China. Which, due to building thousands of coal stations since the turn of the century, and having seen dramatic growth in automobile ownership, has dramatically increased it's emissions. Yet the US and EU have both decreased their emissions even while increasing it's electricity generation - i.e. the carbon intensity for both those regions have lowered.
You cannot simply say that renewables are not helping to lower carbon intensity
in the US and EU, by looking at the carbon intensity of
THE WORLD and one isolated metro in the US (where the situation has hardly even settled I might add). It is even clear that China's carbon emissions growth has been slowing down dramatically since 2010. Likely because it has been deploying renewables at greater scales than the rest of the world combined, even while still building new coal and gas power stations. Simply because it's economy has been growing so quickly. If it's emissions continued to grow at the same rate as it did between 2000 and 2010, then then this graph would need significant head room on the y-axis.
There's a lot of sophistry in the article. Other points of note:
-Electricity from natural gas has played a bigger role in the decline of coal in the US than renewables.
-Market factors: Indian point closed mainly because it could not compete on price. Mainly with natural gas, but for the last few years the cost of both solar and wind, even with utility scale storage linked to it has dramatically decreased. It's operational costs were too high (even though nuclear fuel is relatively cheap - there are many other costs in nuclear power).
-Finally - There has always been huge advocacy from across the entire political spectrum for nuclear. Any advocacy against it has only ever been around public safety and nuclear weapon proliferation. A completely different conversation than the one around carbon intensity. And yes... Also around the cost.

(LCOE) is a measure of the average net present cost of electricity generation for a generating plant over its lifetime.
Not so favourable...
And consider this

But, but... Why are EVs and utility scale storage prices not decreasing?
Because...
The reality is that the question around if intermittent sources can replace base load... Is not really a question of "if". It is a question of "when".
And, the answer: Exactly as soon as battery manufacturing (and that of other potential forms of utility scale storage I might add) meets demand.
And even though business is booming and large (giga, and even soon enough, tera scale) battery factories are in the works, it will be a while.
Batteries are the new plastic. Even battery recycling.
And after all that. I myself have no issue with nuclear power as long as it is safe and economically sustainable.
Plus for all we know, nuclear fusion could become both viable and ultra-cheap in the next few decades. However without it being ultra-cheap... It's prospects will likely be limited to strategic deployment.