Must be that time of the week for DPoS2 to post

One thing completely wrong about his post is that luck isn't expected to even out
It is expected to approach 100% from whatever side it is currently on.

Having a bad block doesn't make lots of good block come around to fix the bad block.

Case in point, we just had an ~600% blocks and we've already passed 111% on this one.

Large (enough) sample stats are all you can expect to give you a good idea of expected results.