Completely wrong. Read the amendment, a person must have participated in an insurrection and it hasn’t been shown that Trump did, that is why he is going to trial.
Now suppose states keep him off the ballot and a jury decides he had no part in the insurrection, are you going to hold the vote again or just say oh well?
How does that make me wrong? Do you think that a judge needs a trial to know whether someone participated in an insurrection or not? Judges are not idiots, and they have quite a bit of power. Here is the entirety of section 3, where does it say or even imply that a person has to have been convicted?
No person shall be a Senator or Representative in Congress, or elector of President and Vice-President, or hold any office, civil or military, under the United States, or under any State, who, having previously taken an oath, as a member of Congress, or as an officer of the United States, or as a member of any State legislature, or as an executive or judicial officer of any State, to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof. But Congress may by a vote of two-thirds of each House, remove such disability.
And you forgot what juries do. They can only decide if they think that enough evidence was presented to find someone guilty. Their verdicts are never "Guilty or innocent". They are "Guilty or not guilty" and "not guilty" only means that the government did not make its case in their opinion.
So even if the most unlikely event possible happened. That a jury voted 12-0 not guilty that is still not finding the person innocent. That is not the standard that the defense has to meet. All they can ever say at the most, if they do not agree with the guilty verdict, is that not enough evidence has been presented to find the person guilty. In reality a judge would probably heed such a sentence. But there is no legal requirement that he do so. Also in reality there is no way that a jury would find that against Trump. He might get a hung jury where it was 11-1 or 10-2 for conviction. No sane jury in the world would find him not guilty 0-12.