First of all, I literally read the spec (and related specs) last week in detail.

Secondly, there's a massive difference between decentralized and distributed systems (I build distributed systems for a living). Perhaps you're confused about that difference?

Thirdly, if you're going to knock a collective effort like ActivityPub by calling it a "horrible protocol" without genuine technical substantiation, you're effectively just trolling. Show us that you know what you're talking about by doing some in-depth analysis of the protocol and where its shortcomings are in terms of being decentralized.