I think he means that the flags are kind of alike because they both have red and white stripes and a blue square on the top left corner with white stars. Only the U.S. flag has 50 stars and the Liberian flag has one star.
You see da Chad flag yea: DA FU***** BLUE IS DARKER THAN ROMANIAN FLAG AND DA ROMANIAN FLAG WAS INVENTED BEFORE CHAD SO CHAD SEEMED AS A GOOD FU***** IDEA TO COPY DA ROMANIAN FLAG so that's da difference 😉