This information from the consulate in Chicago seems to contradict what you are saying.
I think you need to read what you've posted.
I can't be bothered to provide an exact translation, but essentially, only citizens and "nationals" (a catch-all term used to describe legal aliens in the Baltic states) of the countries listed above may apply for it, in accordance with what Dominic and I have told you. There is no possibility for an American citizen to apply for the Karta Polaka.
What you're confusing is that citizens and nationals of the above states can apply for the Karta Polaka without speaking Polish fluently if they're involved with Polonia organisations. This is usually for those from places such as the Asian Soviet republics where there would have been barely any possibility of keeping the language alive - unlike in the near abroad where a very similar language was spoken.
You would have to apply for an investor visa
The Karta Polaka also requires him to speak Polish as a native or mother language, which clearly he doesn't. Even if he was eligible for it, he would fail on the language count.
Poland, wisely, differentiates between the forcibly repatriated Polonia in the East vs those that abandoned Poland. The Karta Polaka exists to try and provide some degree of compensation for what happened - but Americans are in no need of the provisions that the Karta Polaka offers.