I think the article is a bit too close to clickbait, for my taste at least, but I found it it interesting nevertheless so sharing here. A Social Filesystem by the same author is a lot better if you're looking for an accessible introduction to AT Protocol.

How decentralized is Bluesky really? and Re: Re: Bluesky and Decentralization (both by Christine Lemmer-Webber) are the two classics if you're looking to compare & contrast ActivityPub (most famously known for "Mastodon") and AT Protocol ("Bluesky").