It is not, when:
1. The text of the section in question is self-executing on it's face.
2. You literally, when making your argument, had to add language to the existing text to make it say what you wanted to say. That is literally the opposite of textualism or originalism. Sure, maybe the Court will SAY it's textualist, but that doesn't make that true. The Justices change their arguments all the time to suit their needs in a given moment. Look no further than their public comments on Roe v. Wade prior to being sat on the Court, all of them calling it settled law and saying they would respect stare decisis, but as soon as they had enough votes...not so settled law. Ruth Bader Ginsburg at times argued SHE was an originalist., which is obviously patently absurd.
3. In your insistence on ignorance, you're ignoring that the Constitutional argument vs. the statute at 18 USC 2383. 18 USC 2383 (the "Treason, Sedition, Insurrection, etc." statute) is a criminal proceeding. The penalty of not being able to hold office is not a criminal proceeding (neither is impeachment). Let me give you an example:
Lets say you, Offthemat, are just being obstinate about an argument that you are ill-informed on and have to Google constantly to get information that you hope supports your position and you just keep regurgitating it, over and over again. In this completely hypothetical situation, you're just insistent on being so ridiculously ingrained and entrenched on a position that I became enraged and punched you in your hypothetically stupid face. Like I just hypothetically whaled on your hypothetically stupid, stupid face. Now, I could be charged with a crime because of said whaling, arrested, and prosecuted. Now, lets say somehow, I was acquitted of said whaling. You could still sue me civilly for the savage beating I laid on you, and you could still win and be awarded some amount of money to make up for the hypothetical ass-whupping I had laid on you. Even though I wasn't convicted of the same crime in a criminal court!