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I think you mean 165, not 16.5?

But probably, what, only 50m use public restrooms, but some use multiple times, so 150 uses / liter seems reasonable.

That's under 10ml of spray / spill per use, which is maybe a little high but not too crazy? I've seen some pretty bad spill results at work...

If you consider bar restrooms, that is probably skewing the average higher…

I think you drastically underestimate how much 10 ml are.

That's not achievable with backsplatter, that's called "missing".

It's almost but not quite exactly two teaspoons, which is certainly a plausibly achievable amount, but as you say, likely not by splatter.