Also worth noting that he responded to comments on HN:
https://news.ycombinator.com/item?id=20679387

>”I’m super excited to have the Tumblr team and product join the Automattic family. We’ve been evolving Automattic to be more of a Berkshire Hathaway-inspired model and businesses with a lot of autonomy, and this continues that trend.
>”I was very impressed with the engagement and activity Tumblr has continued to have, and I hope that with this new ownership and investment the product will blossom. ”

Excited to see what happens next.