Yes, of course this is "performative". Publishing is performance. Chad is, obviously, performing for his audience in sharing this, he wants to get his perspective out into the world.
Given Chad's decade plus of leading by example, embracing his ideals, it is important to know that he is a person of integrity when reading his words. Could this be a grand lie to some strange end? Sure, I guess, but everyone who knows Chad knows that he is exactly the type of person to mean everything in this letter in earnest.
His blog was part of his job. His job was an open source advocate, he was responsible for talking about open source. He posted on BlueSky in his role as an advocate for open source. Adding in a GoFundMe link that someone emailed to him on a post that got a bunch of attention doesn't undermine his point, at all.
A "hypocritical way to make this particular transition"? He's not advocating for you to make the same transition. He's not espousing moral superiority because he made this transition and you didn't. Life is messy, complicated, difficult, it's not "hypocritical" to... have a BlueSky account as part of your job while announcing you're stepping away from technology.
https://openpath.quest/2024/welcome-to-open-path/
"I work for Sentry, and my job requires me to be a “thought leader,” so I need a platform."