F20-NS: Yes
Rationale
NIP-01 relay subscriptions can aggregate multiple authors and kinds through one connection-scoped filter set. Event delivery does not require a distinct circuit or forwarding entry for every author-reader flow; the relay can match each event against aggregate subscriptions. WebSocket neighbor sessions, subscriber/filter state and stored events remain. This credits absence of mandatory per-final-flow state, not absence of relay state or network-layer multicast.
Assessment method
Documentary analysis and architectural inference
Source context
NIP-01 subscription/filter semantics