Yes, That advice is very generic and would apply only to a system where the pressure is so low the low-pressure safety switch keeps the compressor from operating.

If the pressure you reported is the static pressure, you have most (say half or more) of a proper fill. There is no way to tell if it is completely full from the static reading.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles