Also having a hard time groking it, but from the README looks like maybe the equivalent to setting up a TOR node to front an ssh daemon and routing a shell through the onion network to get to a host behind a NAT.

Edit:

Ah yes, that appears to be exactly what they're doing. Looks like they're using a DHT for peer discovery and using nodes in the network as rendezvous points to get through NAT: https://github.com/holepunchto/hypershell/blob/main/lib/clie...

The code is incredibly straightforward for what it is doing. Expected the ./lib folder to be a lot more intimidating.