Earlier quoted context omitted.
Exactly. I somehow doubt Dorsey doesn't know about ActivityPub - why not just endorse it publicly if he genuinely cared about decentralization? Are there genuine technical shortcomings in the ActivityPub standard that Twitter's engineering team has identified? Why not talk about that and contribute improvements to the standard? Are there shortcomings to being part of the standardization process in the W3C? Then talk…
ActivityPub is a horrible protocol, and not decentralized. Neither of you know what you're talking about, and not even the people working on AP like AP!
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.