>We can derive that around 2% of network entities control 71.5% of all Bitcoin.

This strikes me as misleading. If you exclude miners and exchanges from the "entities" side, you should also exclude them from the supply side. Just eyeballing it from the chart, it looks like around ~3% of all entities control around ~95% of all non-exchange-non-miner supply, which is very close to the number they set out to refute.