Don't get me wrong, it is a fucking sexy graph, but there is variance in there.

First off, each point represents 200+ hands, that's averaging, aka less visible variance. Thus the result should be closer to expected value. 2nd, there are downswings. Each space between horizontal bars is 5x downswing at 200NL.

@25k hands is an 8 buy-in swing
@45k is a 5 buy-in swing
@69k is either a 10x swing at 200NL, or a 5x swing at 400NL

I haven't been playing long enough to have a worst buy-in swing, but I would think you could run 100k hands without >10 buy-in down-swing if you're already a proven winner.