Unlike the normal ECAM flow, the aircraft state you need to analyze for total bleed loss is not available from STS. Hence the additional guidance for RCL.
Although you are right
for some model cases, the QRH guidance needs to cover all of them (the crew clearing one press too much included):
i.e.
At ANY TIME of the procedure, if CAB
PR EXCESS CAB ALT alert triggers: APPLY ECAM PROC