"Along with the new design, you may also notice that comments are no longer present. Don't worry. I love comments. They'll all be back. This is only a temporary state, as there's another notable open source project I want to begin supporting here."
He's just shifted over to a new platform, as you likely would've understood from reading the article. And he explicitly states, as quoted, that comments will be back... Unsure how irony computes in this circumstance.
The irony was commenting about his recent criticism regarding the proliferation of native apps for websites post right after stackoverflow released a native application for their website. If you read his posting on the topic he criticizes things like having different interfaces on every application while the SO app announcement posting prompted the idea of different native interface on each platform. That seems to me that he is saying one thing while his company is doing the opposite, hence the irony. Sorry if you disagree.
He's just shifted over to a new platform, as you likely would've understood from reading the article. And he explicitly states, as quoted, that comments will be back... Unsure how irony computes in this circumstance.