The guy in the video is wrong---and is lying. The job of the Court is to say what the law is. Congress passes laws, and the Court's job is to interpret the laws Congress makes to ensure it is constitutional. If the law is violative of X section, or Y Amendment, then it's struck down. For example, if Congress passed a law requiring that on Sundays, all free speech rights are suspended, then the Court's job is to strike down that law because there is no other check on the law. Similarly, if 100% of the voting population of a given state were to pass a law denying the right of racial minorities to vote, that doesn't make that law constitutional. Granted, those are extreme examples, but they're illustrative.
Also, all federal courts, including SCOTUS, as well as appellate and state supreme courts have reversed laws based on those laws' inability to meet constitutional requirements since the founding of the nation. The right to argue a given law's validity has been essential to keeping the other two branches in check. We're seeing all of that erode now, but the bases of that erosion is found in Congress and the Executive (IMNSHO).