The irony
FTA: "In the Twitter thread, the irony of a Facebook exec lamenting his loss of privacy did not go unnoticed. ®"
Surely there's a double irony that he posted his note on Facebook, looking at the link in the article: "On Tuesday this week, Mark Luckie posted a copy of the note, distributed internally on November 8, shortly before he left his job."
Surely if you're going to try and trash your former employer by publicising an internal message, you don't do it using the service provided by said former employer?