That was a really weak part of the post. Settlement-free peering is when I route your traffic and you route my traffic and they're about even so there's not really anything to be gained by you paying me $1000 this month and me paying you $1000 next month. If Netflix were to start routing Comcast traffic to the general internet at the same rate that they route traffic from their data centers to Comcast, that would be a rather different story.

Offering to just accept and blackhole traffic is silly, and everyone involved knows it. I'm really disappointed that Netflix chose to present that argument in their post, because it's deliberately misleading about the nature of settlement-free peering.