Edit: My bad. I misread the parent comment. My original response preserved below for posterity.
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I’m on mobile so I can’t dig into the source, but they claim it’s using semantic HTML and the data is accessible. If you disagree with those claims, perhaps sharing your specific objections would make a better case than just vaguely crapping on the project.
Make your CSS fit your HTML. Don't make HTML fit your CSS. This framework uses semantic native tables properly.