I don't see a thorough debunking to be honest. The first commentor points to the practical results of particle accelerators. The Vox article (and the blog author) acknowledge this fully. But all examples that are given are the result of past accelerators, where we had reasonable expectations to find new technology because we were still exploring the standard model. This is not the case for a larger accelerator, and this is Hossenfelders point.
The second commenter follows a similar logic. He doesn't seem to engage the point that we don't expect the discovery of something new, he seems to suggest that scientists should build bigger accelerators simply because we can.
But he must know that this is not how science works. Chemists don't just simply perform all imaginable chemical reactions just to completely map the space of chemistry. We allocate scarce resources like time and money to experiments that, according to our best models, may yield promising results. We have ideas for experiments like this in physics, they just happen to not involve a larger accelerator. Scientists are not blind cartographers.
That is not at all how science works. Models yield predictions about the world, not "results" as you suggest. We design experiments to test if those predictions, and thus the models, are correct. Often, new "results" are found when a model fails, and that is why we test boundary conditions.
There is no way of predicting which line of work is likely to yield new physics as you suggest there is.
Neither of those twit sequences directly address the points made. Yes, a larger collider would probe the Higgs field with more precision. It would lead to more precise measurements of what is already known. The question at hand is "is it worth 20 billion dollars"? And if it is, why are all the press releases surrounding the proposal hyping up new physics?
The first link is not very compelling. Nobody disputes that particle physics has produced useful derivates for humanity in the past. The question is whether it will in the future, and whether they will be worth $20B.
The second commenter follows a similar logic. He doesn't seem to engage the point that we don't expect the discovery of something new, he seems to suggest that scientists should build bigger accelerators simply because we can.
But he must know that this is not how science works. Chemists don't just simply perform all imaginable chemical reactions just to completely map the space of chemistry. We allocate scarce resources like time and money to experiments that, according to our best models, may yield promising results. We have ideas for experiments like this in physics, they just happen to not involve a larger accelerator. Scientists are not blind cartographers.