After going through the article, I'm not seeing anything that supports or justifies the phrase "decentralized" or even "semi-decentralized". The terminology should be "distributed".

Claiming this is semi-decentralized is confusing, and seemingly wanting to borrow from the recent success of decentralized systems (like IPFS, ours, GUN, and others) without being honest: There system is distributed, not decentralized. In the same way "Serverless" totally requires using servers.

Otherwise, very good article.