I think he may have had it driven home to him that the cost of this march would be more than would be reasonable consequences...
But this isn't 'fighting for liberty' v caving, it is, even if he did get pressured, 'this specific march where he would be handing them an obvious law violation to use against him' vs changing the march a bit. I won't prejudge future actions.
Yeah the federal response even shocked me. And you know what, one person won't do it all. But at least we know what scares the living shit out of them. Some on the internet saying "NOW! March on DC." And people actually having balls to sign up for it, publicly. Thousands not afraid of their petty little criminal system, even if they just walked peacefully it would show every one, any time you are ready you can take us down. They can't let the myth of their power to be broken.