C03-LP: Yes
Rationale
RFC 9001 protects established QUIC frame contents with AEAD and protects packet numbers and selected header bits. This credits protected control contents under the same framing exception used for TLS columns: connection IDs, the fixed bit and optional spin bit remain visible. It does not mean all headers are concealed or that QUIC is unrecognizable.
Assessment method
Documentary analysis
Source context
Primary specification / selected profile