This isn't an article about heroism. Keith Teare claims he co-founded TechCrunch. Arrington says "no" and then details why.
One part of the "why" is about value-adding output. Arrington "could never get [Teare] to write anything, or help pay any bills." Co-founders add value; Keith didn't do that.
The second part of the "why" is about input. Output requires input. But it's fair to highlight both, in part to block claims of unappreciated work. In highlighting Heather's "20 hour days" and "sacrificing [of] her personal life," Arrington draws into contrast the difference between someone he considers a co-founder and someone he doesn't.
> 20-hour days are not actually worked
Founded a company. Worked twenty-hour days. Deceptively easy to do if you're chasing a short-term deliverable across multiple time zones. (Short-term because this tactic is obviously unsustainable.)