As has historically been the case. It appears that the entirety of the partisan political response by the Republican Party is premised on manipulative language aimed at their followers. Republican legal spokespeople and politicians have coordinated their media response against the indictment of the former President; intentionally mis-describing them as being based entirely on the few comments made at the rally in front of the White House on January 6, 2021. This is crafted misinformation for the consumption of followers that still remain loyal to their un-American cause.
Reading the actual document (click) of impeachment makes it abundantly clear that the trial intends to cover all the actions geared towards the insurrection which were acted out over the course of several weeks following the election where the former president lost.