Later in the post this phenomena is explained a bit: networks collating and rebuilding in repeated cycles.

I like this post. Looks close to my observations while calculating various network metrics for LN

However, it feels like there are not enough conclusions and generalizations for Bitcoin/LN specifically. For example these networks are wildly competitive so maybe it makes sense to research its evolution.

In addition, in LN big hubs have higher security risks. And we may redefine "hub" term as such. It may be hub with low liquidity but many channels and it may be "money hub" with large liquidity and very few connections.