Generally crimping and soldering combines the worst of both worlds and be less reliable than either connection because a good crimp forms an airtight connection, while solder wants to get inside the crimp and deform plastically under pressure. I'm not familiar with crimp connectors that use hex screws, but if they form a solid crimp, I'd prefer to rely on crimping over soldering.
Gold-plated screw-mounted fork instantly makes me assume they’re using something made for audio, like the ones in the attached photos. Ignore that OP said anything about crimping, because it’s not.
These have screws that come down on top of the wire and will push it out on to the back side of the connector. They do not require a crimp tool so I am not sure how good of a gas tight connection they will make.
It’s simply a screw terminal, not a crimp. Crimping is an irreversible process. I suspect that, if torqued down enough, a screw terminal can make a gastight connection, especially if a ferrule is used to prevent strands from escaping. But I doubt that the screw threads in copper are strong enough to torque down that hard, I suspect they’d strip first.
Edit: file:///tmp/mozilla_mint0/p18-21-1.pdf
Please upload the file; a local URL to a temporary file on your PC is useless.