Thanks!
ipfs swarm peers | grep 12D3KooWFkPkpLWTKDDbE4Dtdknrhj17KTEsduYp4cnS9aYeUuYF
/ip4/5.161.92.43/udp/4001/quic/p2p/12D3KooWFFhc8fPYnQXdWBCowxSV21EFYin3rU27p3NVgSMjN41k/p2p-circuit/p2p/12D3KooWFkPkpLWTKDDbE4Dtdknrhj17KTEsduYp4cnS9aYeUuYF
That answers my question:
Does it use a relay for the pings?
Yes. PeerID 12D3KooWFFhc8fPYnQXdWBCowxSV21EFYin3rU27p3NVgSMjN41k acts as a relay to 12D3KooWFkPkpLWTKDDbE4Dtdknrhj17KTEsduYp4cnS9aYeUuYF