Going to www.cars.gov does not do this. Spreading misinformation does no good. The government has fully admitted to the language of the site the dealers use. See this: Freerepublic
As a matter of fact, I've been there several times, just to read up on the program, I've never been given the opportunity to log in, nor have I even come across this disclaimer. Even on the dealer side of cars.gov. There doesn't even appear to be a place to log in.
But see, since these folks see or hear hysterical "Oh noes! Don't go to the site!!~!" they, well, don't go to the site, and consequently don't do what you reasonably did. Instead they swallow it hook line and sinker and pass on what they just fell for.
Its really not much different than the hoax email warnings breathlessly imploring you to "Send this to everyone you know!!!" that people new to the net irritate all their savvier friends with.