Do we really have to engage in this level of mental gymnastics before we just genuinely look at the banking system consolidating and producing money out of thin air? Does the explanation really need to get this complex?
Your figures for China's mix are meaningless because you don't bother to mention when you think "saturation" occurs. They are on track to build far more Nuclear than 2-3% of their current mix in the next 20 years - and this is as the world's top manufacturer of solar and wind products.
It's too costly to build high speed rail in many parts of the world (California for instance). It's not because high speed rail isn't a viable solution, it's regulation.
The article you posted from sciencedirect supports this. The study points primarily to a changing complex regulation landscape as a primary driver of costs. Meanwhile, France is in an excellent position in the EU in terms of energy in large part because it stuck with nuclear instead of attempting unsuccessfully to transfer to wind and solar like some of it's neighbors (who now burn lignite to meet energy demands).
Solar panels, for instance, are mostly made in places where actual costs of construction are externalized to the environment and workers with depressed wages. Nuclear plants need to be built and decommissioned in the same place - places that are often actively hostile with complex regulation meant to curtail nuclear specifically for the sake of non-proliferation. SMRs help sidestep a portion of this hostile regulation but there are countless reactor designs that are possible that we can't even begin to explore until regulation is made reasonable.
The cost of nuclear is primarily from regulation/human decision making that prevents it from externalizing its costs onto the environment (decom costs, waste handling) not physics. Wind and solar are limited severely by physics and they are much more vulnerable to a changing climate. China eating its own dogfood with heavy investments in renewables is meaningful but only illuminates some of what is happening. A significant amount of this stuff is going into the ground in 25 years and it won't be handled with nearly the safety and care as waste streams from nuclear power.
You are being purposefully aggravating here because your argument is weak but it's been socially supported for some time now. Nuclear power lagged behind renewables due primarily to proliferation fears and subsequent over-regulation in most of the world, not technical flaws, missing out on innovations like modular reactors. China’s pushing ahead with 150 GW by 2030, leveraging nuclear’s advantages: it’s compact (1-4 sq mi/GW vs. solar’s 10-20), reliable, and resilient to extreme (and simply changing) weather, without reliance on rare earths or massive storage (with their own host externalizations and supply risks). Costs can drop to $50-100/MWh with new tech and long lifespans, rivaling renewables when accounting for their hidden expenses (storage, grid upgrades). Proliferation risks exist but can be managed with oversight. Nuclear remains the best bet for scalable, clean energy.
We were originally discussing offshore wind. These things have to function in some of the harshest conditions imaginable. We don't really fully understand how weather patterns will change over time with climate change. The idea that these factors won't represent serious risks to output over 50-year lifespans is delusional. We should be building modern nuclear reactors. Small scale distributed solar in sunny environments is fine - the rest of this stuff is just a massive waste.
I am suggesting it as a way to do a back of the envelope calculation that can be thoroughly checked manually. It's very easy to check the numbers yourself.
You distribute pv and wind over large areas and they get destroyed by weather, get dirty, require significant maintenance. If individuals want to have wind turbines or pv installations that's great - but these things are a giant mess at grid scale - absolutely awful.