The answer is yes according to code and documentation [0]:
> The stream multiplexing capabilities of QUIC allow reducing the head-of-line blocking that SSHv2 encounters when multiplexing several SSH channels over the same TCP connection
....
> Each channel runs over a bidirectional HTTP/3 stream and is attached to a single remote terminal session
The answer is yes according to code and documentation [0]:
> The stream multiplexing capabilities of QUIC allow reducing the head-of-line blocking that SSHv2 encounters when multiplexing several SSH channels over the same TCP connection
....
> Each channel runs over a bidirectional HTTP/3 stream and is attached to a single remote terminal session
[0] https://www.ietf.org/archive/id/draft-michel-remote-terminal...