What the primary record establishes

BIP 324 specifies an encrypted version of Bitcoin’s peer-to-peer transport. A passive observer has less access to the contents of messages carried between two peers using v2. Bitcoin BIP 324 ↗

What the distinction changes

The protection is hop by hop. If A receives a transaction over v2 and relays it to B over v1, the two links have different protections. The transaction still becomes public if included in a block.

What to check before drawing a conclusion

BIP 324 does not authenticate the peer by itself. An active intermediary controlling a connection may try to establish two separate sessions. The session identifier can support an authentication layer above the transport. For monitoring, distinguish a node’s support for v2 from the transport actually negotiated on each link.