Hello Frank,
No, there is still a chance Trump could be convicted. It ain't over till it's over. I agree the odds are slim. But no matter how certain it looks, there is no predicting the outcome of a trial. It could still go either way. The Senators are not dummies. Sure, they are afraid of being tweet-shamed. That is strong. But they also know that, with or without witnesses, this story continues to evolve and the truth will come out sooner or later. If they are caught on the wrong side of the decision that will go badly for them in the next election. They know they need to consider the current events and threats as well as what lies down the road.
Technically, you are correct...he could be convicted. In this case, punters would call "acquittal" a prohibitive favorite...and would probably write it PROHIBITIVE FAVORITE.