It actually doesn't really show much, except maybe that inflation exists and people generally have more money now.
If it's supposed to show how the rich are getting richer and the poor are getting poorer, it does a lousy job. It's practically impossible to see the relative change between the groups, since the lower two graphs' behaviors are impossible to see. The only thing that can at least somewhat be seen is that the top 10% and the top 1% grow quite correspondingly.
So, basically that graph shows that everything seems to be as fair as it has always been. Probably wasn't the intention, and certainly not a good representation of what's happening. It's very possible that the top 1% is included also in the top 10% and dominates it, but just based on that graph it's impossible to know.
That's a weird k-hole if he's still in one.