Hmm, tbh, I've not seen a pure, bridged modem in years. In the old days that was common, but all modems I've seen the last 10 years have a build in router. Even the Cable modem I have here has build in features to negate DDOS attacks, and other options to negate various attacks, Wireless, guest access over wireless and even wireless for all users of my ISP, which is simular and separate of my guest access.
But also, the article fore-goes the entire IPv6 discussion, for all the advantages for having a router with IPv4, well, they don't work with IPv6.
If the article would have been written 10 years ago, I would have understood why it is bringing the message, but as they say: too little, too late.