The values suggested are north of the ultimate tensile strength for carbon nanotubes and graphene. It’s in the ballpark of the center of the earth. I don’t think it’s as simple as tightening a bolt.
A DAC works because you use it on a tiny surface area (measured in microns). The application was power transmission cables.
Hell, I'd even call it "not incomparable to the pressure at the center of the Sun". I mean, it's still like ~100x smaller than the smallest estimates, but it's also only 100x less pressure than is plausibly at the center of the Sun.