I see a link to FTC.gov which seems legit but why does this site look so different and amatuer?
I can't answer why it looks amatuer, but the Federal Trade Commission is in charge of the do not call list and website (listed). Government websites will have the .gov on them also.
I'm sure like you mentioned though that there are a lot of scams out there, they are everywhere. I seriously doubt though that the site mentioned is a scam.