Example: The "casino Indian" trope was hardly invented by TFP. It has been around for a couple decades now (at least). But it is an entirely false trope. Individual Native Americans cannot own casinos - only tribal governments can; profit from casinos must go to social welfare programs, not individuals; tribal casinos have never been hotbeds for organized crime; tribal casinos are required to make compacts with state governments (meaning any riches Native casinos make must also make the "White" state governments rich); and all of this is micromanaged by the U.S. federal government.
The "casino Indian" trope was not created by TFP, but it is a negative stereotype which is accepted by most people (who probably do not even know it is a stereotype), and it is used exactly as TFP is using it: to present Native Americans as corrupt, greedy, criminal, and antagonistic to White people.