I think something got a little bit jumbled in your quotation, but I belive you are asking if the terms "WAN" and "Internet port" mean the same thing.
If that is the case the answer is sort of muddy. Technically the answer is no, WAN means wide area network and Internet mean connected to the public Internet backbone. What wide area network really means is a connection between sites. So if you had a company that had a remote site or office that it wanted to connect directly back to it's main site that would be a WAN connection. However: real WAN connections are becoming more and more rare. Most companies nowadays will use the Internet as a substitute for real WAN links. Much of the time this will be a VPN tunnel over the Internet so the tunnel is really the WAN connection and it rides over the Internet connection.
That said some people just throw trems like this arround and who knows what they are really impling when they use them.
