[chmod600]

Both are important. Censoring something important without knowing whether it's true or not is pretty worrisome. If it does turn out to be true then it's much worse. If it turns out to be false, the censor got lucky or knows something we don't.

One thing I'm wondering is how can they censor it without getting either some evidence that it's fake or at least a clear denial? (Biden's campaign released a statement refuting it, but that's not the same as Biden himself publicly denying the claims.)

Thin evidence (someone found some damaging-looking emails) can be dismissed with thin counter-evidence (a denial). But it can't be dismissed with nothing.