GRIB2 load for GDT90 (space view).

I'm missing/misunderstanding this case.  

I think, if Nr is set to 'missing' then this should be an orthographic projection
GRIB: '(5) For orthographic view from infinite distance, the value of Nr should be encoded as missing (all bits set to 1)'

If Nr is zero then the satellite has crashed

Am I missing something?