Yes, I should have been more detailed in my response.
You're right that all of them give a quantative score, not a qualitative score like "native". There are qualitative scales where one of the labels is "native fluency". For example, the Interagency Language Roundtable has level 5 (native/bilingual fluency) which means the speaker has "complete fluency in the language, such that speech on all levels is fully accepted by educated native speakers in all of its features, including breadth of vocabulary and idiom, colloquialisms, and pertinent cultural references".
Other people have devised concordances that map the quantitative scores from things like TOEFL onto the ILR labels.
ILR level 5 is a very high bar, though, as you point out elsewhere. It is unlikely that Facet truly needs someone at that level, they'd most likely be fine with level 4 or level 3 speakers.
But reaaaaaaaallllly, I suspect we're all ironically missing the point of the communication. On the one hand, we can construe it narrowly and it may be technically flawed. On the other hand, it's marketing copy and I suspect most readers treat it informally, especially since their audience is entrepreneurial people who want to do contract work -- a pool who is likely to ignore the strict letter of the requirement and apply anyway.