Mach 1.25 is supersonic. But wasn’t the Concorde SST faster?
concorde maximum speed was 2.04 mach (according to wiki) (sorry for referencing wiki but hopefully this is not politically controversial).
I inflight refueled the B1-A many moons ago 1968 or so it was supersonic Mach 2 they say, nut Jimmy the peanut farmer cancelled them. Or course the Concorde could sustain Mach 1.25, but the B1-B attributes is speed and sneak in low level.