In article ,
says...

Well, its a clever system. I guess it was only shut down as a precaution.
could easily have been a sensor issue. If the craft had been near its limit
in weight though, could this still have been achieved.

The video of the launch seems to make it clear that it was not just a
sensor issue.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer