If you look at this one you will get a better perspective.
https://www.digitalbitrate.com/dtv.p...ive=47&lang=en
They do seem to have been experimenting with 5 stat-muxed channels alongside the fixed bitrate local channel but have rolled back to 4 stat-muxed services with today's changes. I would hope that having 5 stat-muxed channels was a configuration error as that many services on a QPSK mux would be very bad. They could convert to QAM-64 to add more services (as the GMUX did) but that would make the signal far less robust and severely reduce the coverage areas of the multiplexes. They won't be allowed to reduce the coverage areas for local TV so that is a non starter.