I don't get exactly what PMO was saying but having a look at the site myself the issue I'm seeing (if its based on a scale of 100) is that there isn't any sort of Z-score we can convert all the ratings to.
That being said it looks like the editors haphazardly convert other reviews to their number system with no actual math, just a sort of "eh this look like a 75 rating" attitude and if anything thats where the bias comes in (by proxy of laziness)
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