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Maybe they're trying to see what the difference in numbers is between the two products?

Yeah that's what I thought too

I was under the impression that Mixpanel was a different product. ie: tracking events and real-time stuff versus just page views.

It's not that bad an idea, it's a kinda obscure page that still gets plenty of hits that they manage -- why not do some competitive intelligence to see if your results are the same as what others are doing?