F09-NS: Yes
Rationale
Select concurrent publication of one signed event to two independently reachable relays. Both paths carry useful copies of the same communication, not unrelated sessions. This is event-level parallelism, not multipath inside one WebSocket.
Assessment method
Documentary analysis
Source context
Primary specification / explicit profile inference
Outstanding qualification
Shared F09/F10: pin a client that publishes concurrently before any failure; verify identical event IDs, independent routes, duplicate handling and costs. Multiple relay URLs alone do not prove path diversity. No execution performed.