See for example http://time.com/3901378/netflix-internet-traffic/ Note that the metric is actually downstream peak time consumer ISP traffic which is a little different than "40% of the Internet," but the fact remains that Netflix is using FreeBSD to serve a phenomenal amount of traffic.

If you think someone may be saying something ridiculous, please reread carefully in a charitable manner (charity was not even required here).

Netflix video accounts for over 40% of all internet traffic, yes.