It wasn't illegal, was it? Fox won that court case, because they stated that Tucker Carlson is commentary and not factual news reporting. Which is exactly what his show is, and the judge agreed.

At any rate, do you really think other news companies or talking heads never say things others think are untrue? The reason Fox ended up in a lawsuit is because people on the left are much more determined to take out anyone saying things they don't like than the other way around. It's not because CNN is actually more reliable.