Got a reference for that?
What 14 CFR 61.75
actually says is:
(c) Aircraft ratings issued. Aircraft ratings listed on a person's foreign pilot license, in addition to any issued after testing under the provisions of this part, may be placed on that person's U.S. pilot certificate for private pilot privileges only.
My bold.
You may or may not be correct about the 61.75 certificate being a "house of cards", that's your opinion, but please do try and get your facts straight because people might believe you.