Of course the truth damages Trump, but the question is if it rises to a level for impeachment, just like the increased scrutiny of Joe and Hunter damages the Bidens. The problem is that the Democrats made so many mistakes along the way that the result was inevitable. They attempted to build their case in a bunker, in what should have been a very open and public trial in the House. They brought in dozens of witnesses and some of them told them what they wanted to hear and they got excited and decided that they had their impeachable offense - enterprise sales reps call that "happy ears syndrome" where a prospect says exactly what a sales rep wants to hear and they think they have a whale on the hook, only to discover that they don't have the budget or power to make it happen.
The Democrats then picked the half dozen or so that told them what they wanted to hear and put them in public and they faded in the light of day. They said their piece and then under cross-examination their stories went from "I was there" to an REO Speedwagon meme ("heard it from a friend, who, heard it from a friend, who, heard it from another that you' been messin' around") that actually made the rounds better than the story the Democrats were trying to sell. Then there were the inevitable leaks and we find out that there are problems with the stories and problems with the "trusted" individuals, secret meetings, potential lawmaker interference, and THOSE stories actually made the rounds and people noticed what the media was willing to say - costing them even more credibility. Despite that, and after underwhelming the public with story after story after story, the Mueller Probe/Report, then the absolute failure of the Mueller Hearings, a search for tax records, business records, Michael Cohen, Michael Avenatti, Stormy Daniels, whining about enforcing the border, false stories about border conditions, then child separations, anti-ICE actions, sanctuary cities/counties/states, etc. - they decide to impeach on emotion instead of actual crimes/misdeeds.
Because the House rushed their investigation/hearings/vote it was incomplete. Then despite the fact that they "had to move quickly because it was a national security/emergency to prevent further damage", they waited for a month to present their case to the Senate to try to dictate how the Senate was going to proceed. They wanted a "fair trial" in a situation where they had blocked Republican House members from being able to call any witnesses during the public hearings...… and everyone saw through that. The very 1st question yesterday (from Susan Collins on behalf of Lisa Murkowski and Mitt Romney) was very interesting (paraphrasing) "can there be a situation where something that is in the national interest also be of political benefit to a candidate"? The answer is yes, and that would call nearly every action by a politician into question because everything they do is in that realm.
That's really the heart of the matter for everything the Democrats hate about Trump, he seemingly does what he thinks is good for America. The fact that he and his friends and most of the citizens are vested in American success means that they will all benefit it America does. Like the CEO and employees that own stock in their company. That doesn't make it wrong nor impeachable.