I'll challenge that as an overstatement. I'd be pretty suspicious of any Film Compax that WASN'T a ref 22522, for example. And certain case references tend to be Medicos, and others not, and certain Compurs, and certain Uni-Compaxes.
In this case, I will agree that not all 22522s are Film-Compaxes. However, all the 22522s from this serial number range (n=5 including this one), including a 1714506 (just 6 numbers away) ARE Film Compaxes, except for this one and one obvious redial. The examples that are not are in different serial number ranges, at least according to the ones I have written down. FWIW.
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