As critical as I am of Mullenweg, I am sure Automattic is obeying the Affordable Care Act and giving employees health insurance. It would be a dumb thing to save money on when you're paying competitive wages!
This seemed like an adequate explanation without needing any details:
> incurred by the closing of my conference and publishing businesses.
I thought it would be rude to speculate on details since it's speculating on a person's life and decisions. But when times are tight, independent contractors and sole proprietors might make the decision to temporarily cancel their own health insurance to save money, since premiums are considerably more expensive than the income tax penalty. This works for saving month-to-month income, at the cost of potentially enormous medical debt if you get sick or injured during this period.
This seemed like an adequate explanation without needing any details:
> incurred by the closing of my conference and publishing businesses.