There is some truth here, and as much as I thought the Clinton impeachment was a partisan attack motivated by a desire to destroy the Clintons, the senate at the time decided that Clinton's misdeeds were not worth a conviction. The author is clear that the subject of today's trial differs significantly from that of Clinton's, and Trump's transgressions were much, much more of an existential threat to the Republic. It doesn't mean, though, that Clinton's actions weren't criminal.
I find the premise that things would go differently today if the senate had convicted Clinton to be flawed. Perhaps things would be different, although I am highly skeptical that Republicans today would act with honor. They've shown their disdain for precedent many times in the past five years in their pursuit for power, even brazenly abandoning rules that they themselves set.
I support this impeachment process unequivocally as an American and a nearly lifelong Democrat. In a perfect world, the impeachment jurors would bar Trump from ever holding public office again. In this world where truth is optional and the current crop of Republicans is only interested in remaining in Trump's good graces, we run a genuine risk of a future Trump campaign. If we're lucky, the criminal justice system will uncover wrongdoings that will prevent a future Trump presidency.