Same problem for you under American law. Where is the evidence that Limbaugh attempted to cause the use of force, or that he advocated the illegal occupation of federal property or the taking of federal property?§2384. Seditious conspiracy
If two or more persons in any State or Territory, or in any place subject to the jurisdiction of the United States, conspire to overthrow, put down, or to destroy by force the Government of the United States, or to levy war against them, or to oppose by force the authority thereof, or by force to prevent, hinder, or delay the execution of any law of the United States, or by force to seize, take, or possess any property of the United States contrary to the authority thereof, they shall each be fined under this title or imprisoned not more than twenty years, or both.
Maybe.
But there must be limits to the application of First Amendment protection to DELIBERATE lies about the legitimacy of the US government, the president, etc.
You shouldn't be able to say "Joe Biden stole the election. The government of the US is not legitimate." over and over again if you have no subjective belief that this is the case.
Being wrong about a matter of electoral law, or even lying about what electoral laws require, or even lying about facts connected with the election, without more, is not a crime.
As to your law reform suggestion, no thanks. Did you learn nothing from all those novels and films depicting the dark consequences of law enforcement based on "thought crimes"?
The remedy for speech that is incorrect is more free speech. If the Dems want to shut down the distrust that is out there, the only way to do it iis to engage in fair and comprehensive hearings on the integrity of the election, or to appoint a bi-partisan/non-partisan commission to do the job. Nothing else will work. I look forward to seeing what choice they make. I predict they will opt, instead, for hoping that voters will just give up and accept the refusal of Congress to respond. That won't work.