That's great, good for him.
The underlying problem with Twitter, in this SPECIFIC instance, is Twitter was overstaffed by all objective measures, and that leads to a corporate culture of underwork. The "unlimited PTO" contributes to that, because there is no culture like previously mentioned in today in this thread by others where people feel "guilty" letting their co-workers shoulder the burden, because the burden is so light.
With the cuts (and I would bet there are going to be more), there is burden.