From what I understand ... When the lower court in Colorado found Trump to be eligible, what it found was that Trump did indeed engage in insurrection (a finding of fact), but that the Presidency is not an “office under the United States” so the 14th Amendment doesn’t apply (finding of law).
On the appeal, the Colorado Supreme Court said that why yes, the Presidency is an office under the United States. They didn’t really address the finding of fact, which, as I'm not sure .... I understand is usually left up to the original courts who heard the arguments from the witnesses themselves, judged who was credible?
So now SCOTUS is considering it. The legal analyses that I’ve seen pretty much all say that whether Colorado’s ruling stands or falls depends on whether the “office” term applies here, and not on whether Trump’s action constitute insurrection? (considering all the evidence, it is obvious that was his intention)