Yankee Chronicler
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I wouldn't say that's a mistake. "Separate facilities" are just not "unisex facilities". If you provide unisex facilities, then you don't need separate sex-specific facilities. You still need to provide the plumbing fixtures as if there were separate facilities, but you just don't need to call them separate facilities.
Example: you need 6 water closets - 2 men, 4 women. You can either have two separate facilities (i.e., a men's restroom with 2 WC and a women's restroom with 4 WC) or you can provide 6 unisex water closets (i.e., 6 single-user toilet rooms or 1 shared all-gender restroom with 6 WC). At least, that's the way I've been told to do this by a few plan checkers...
With all the gender confusion in today's society, I think this is the way the codes are heading. Several years ago I encountered this in an airport in Europe, during a stopover for a flight change. All water closets were unisex, each WC in its own private room. The rooms were about the size of our ambulatory toilet stalls, but they had floor to ceiling walls and real doors.