everyone has the right to their own opinion. Don't take this as fact. Just an opinion from a OpenBSD developer.
I understand and know how to use Linux a lot more then BSD. Which one do I prefer? Whichever one gets the job done.
BSD is preferable if you are creating a closed source project in which you plan on selling.
Linux/BSD is suitable if you plan on selling services.
edit: I also disagree with certain things he said too.
But again, that's just my opinion. He generalizes too damn much.