It probably doesn't specify vinegar, but a general "do not mix with other cleaners"
Without going back and straining my eyes, I don't think it even goes that far. Just do not mix with acids, and it specifically called out "urine and feces", from which I guess we're supposed to surmise that it is not a toilet cleaner? It's a difficult problem, yes, because "but it didn't say not to..."
But again, I'm pretty sure the solution does not lie in a wall of 6 pt. text., regardless of what it needs to say.
It probably doesn't specify vinegar, but a general "do not mix with other cleaners". If it only said vinegar, then someone would mix it with ammonia and when they died, they'd claim "it only said vinegar!"