There's a significant difference in stating something false and treating it as true, and stating something false, and being required to label it as an opinion.

What she's suggesting isn't a violation of free speech or of enforced censorship, it's a call for the requirement of factual evidence to provide information that is claimed or inferred to be fact. In fact, this was already a law in the past, until Obama had it removed. The media hellhole that we find ourselves in now can be directly attributed to that law being removed.