Non-ETOPS critical fuel

[FE Hoppy]

Critical fuel scenario - The critical point is the furthest point from an alternate aerodrome assuming a simultaneous failure of an engine and the pressurisation system. For those aeroplanes that are type certificated to operate above Flight Level 450, the critical point is the furthest point from an alternate aerodrome assuming an engine failure. The operator should carry additional fuel for the worst case fuel burn condition (one engine vs two engines operating), if this is greater than the additional fuel calculated in accordance with AMC OPS 1.255 1.6 a and b, as follows:
A. Fly from the critical point to an alternate aerodrome:
- At 10 000ft; or
- At 25 000ft or the single-engine ceiling, whichever is lower, provided that all occupants can be supplied with and use supplemental oxygen for the time required to fly from the critical point to an alternate aerodrome; or
- At the single-engine ceiling, provided that the aeroplane is type certificated to operate above Flight Level 450.
B. Descend and hold at 1 500 feet for 15 minutes in ISA conditions;
C. Descend to the applicable MDA/DH followed by a missed approach (taking into account the
complete missed approach procedure); followed by
D. A normal approach and landing.

Does anyone know why aircraft certified to operate above FL450 don't have to consider depressurisation in the critical fuel scenario?