Or it's just a message to his friends and colleagues that's not intended for wider distribution. Just a little public blip of "hey, I'm not at this company anymore, but I still exist and I'm doing something new".

Hacker News does this all the time: take something that's on a person's personal website/blog that might be intended for a limited or self-selecting audience, or meant as a joke or off-the-cuff remark and blow it way out of proportion.