As expected, the pro-nuclear comment is cherry-picking the details of the argument to make a poor attempt at a rebuttal. Did you miss the part where the proposed system was almost half the cost of the nuclear plant? That leaves quite a bit of money left over to address the long tail risks. A few nat gas peaker plants that rarely if ever get run could be more than sufficient. Maybe include a carbon capture system if you are so inclined. I am more than happy to entertain counter arguments, but please make a more comprehensive evaluation of the original argument before responding.
Nuclear is crazy expensive. Our current renewable technologies, at current prices are capable of providing solutions that in aggregate largely deliver the generation profile of what nuclear can provide at a cheaper cost. This is true for most regions of the world with the exception of the extreme latitudes. And renewables for the most part are continuing to get cheaper, whereas nuclear for the most part has only gotten more expensive. Also, the renewable solution, by incorporating multiple technologies will have greater reliability than the single point of failure that is the nuclear solution. And the renewable solutions can be built out in a few years, very likely paying for themselves before the nuclear solution is even producing its first electron. This is an issue that the pro-nuclear likes to ignore entirely because it is so damning. If you were a free market energy investor, would you rather invest in a capital project that pays for itself in 7-8 years, or a project that doesn't even start making revenue until 10+ years down the road, and has enormous amounts of uncertainty around ongoing maintenance costs to the point where it is not even certain the project would produce enough revenue to offset those? There is a reason renewable projects are getting built left and right, and nuclear projects are few and far between. It is because investors and project developers are running the numbers, and they know which technologies will make them money and which ones won't.
These are all essentially facts. They should be your starting point when attempting to make a pro-nuclear argument. If you fail to address these facts in your counter argument, you will not be taken seriously.
The main problem right now, is that when an energy developer goes to build a project, they are not seeking to build a robust renewable solution that mimics the generation profile of a nuclear plant, they are incentivized to build for the thinnest slice of the generation market as possible to keep costs down. There is some movement in the direction of these more robust renewable projects, we are starting to see more and more solar and wind projects with on-site storage for example. But what we really need is utilities and their regulators to step up and start shaping the energy market to incentivize these more robust renewable packages. Until then we will continue to see incidents like the Texas outage. And FWIW, nuclear will need a fairly large helping hand from those same regulators as well if it is to every be viable, so the need for regulatory changes isn't unique to renewables.