It seems to aim at correcting the technical analysis sometimes/often done about High-Ground advantage (with lower case a). It also suggests that some people intentionally spread misinformation. But the post itself is fairly criticisable. Two points :
a) The post only discusses the Advantage gained from High-Ground (with upper case A, i.e. the mechanism).
But High-Ground also means that enemies have Low-Ground and attack with Disadvantage. This far from negligible.
So the conclusion about "height advantage" being not as bad as many people claim is really just about Advantage not being as powerful as a sometimes claimed. Maybe Darun only meant to talk about Advantage, but then it would have been better to not involve height/High-Ground in the discussion and avoid the advantage/Advantage ambiguity.
b) The assumption of uniformity of hit chances along the whole spectrum is very criticisable. You don't encounter enemies that you have a 10% chance of hitting that often, I would think (depends on GM of course). If you go for uniform hit chance between 30% and 90%, say, you find an average equivalent bonus of +4.1.
I'm not saying the Original Post is itself a clear vector of the disinformation (intentional or not), incorrectness and misconceptions it purports to rectify, but I find it uncomfortably close to that.
Having said that, the really interesting topic (to me at least) is Advantage. Which I'll make another topic for.
