1) Why should people leave Twitter just because E.M. purchases it? What changes does he have in mind that people supposedly fear so much that they think about moving to the #Fediverse -- of all places!
2) The author's categorisation of user groups (# 6): 1. Programmers & tech enthusiasts 2. LGBTQIA+ 3. Furries 4. Neurodivergent may be true for some Mastodon and Pleroma instances, but to reduce the Fediverse inhabitants to these four groups, even call them core groups, is ridiculous.
3) His advice to scale quickly, i.e., to build more instances, is misguided, as more instances still face the already endemic problem of mutual de-federating of instances (and the subsequent break-up of the Fediverse in various mutual excluding Sub-diverses). More machines will not alleviate the pressure of the expected wave of new people, as the machines won't interact. Instead, the result will rather be more silos, i.e., more Twitter imitations.
4) Building the Fediverse (# 18) is "about building a ROBUST social media infrastructure that is protected from the whims of shareholders and governments". Nah, that is the usual understanding of instances as machines whereas instances are rather conversations. As shareholders and governments are not interested in conversations, they won't be interested in the Fediverse.
After all those years, people still don't understand the Fediverse. And THAT is quite interesting.