[FLT-bird]

He mentioned it 24 times in his address to the Confederate Congress on April 29, 1861.

But never once in his inaugural address.
https://jeffersondavis.rice.edu/archives/documents/jefferson-davis-first-inaugural-address

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Thank you for that blinding flash of the obvious. Secession itself is not rebellion. Secession itself is not treason, even when done illegally. Rebellion is rebellion. Waging armed rebellion against the government is treason. Davis was certainly guilty of that.

Secession is perfectly legal and is not rebellion. One cannot rebel against a government one is no longer legally a part of.

[rockrr]

Just because you shove a knife in her back and shout that you’re done doesn’t mean that you’re no longer part of something you committed to.

[DoodleDawg]

But never once in his inaugural address.

But 24 times in his address to the Confederate Congress on the occasion of the ratification of the constitution: Link

Secession is perfectly legal and is not rebellion.

If done legally. But legally or illegally it is not treason as defined by the Constitution.

One cannot rebel against a government one is no longer legally a part of.

Key clause being "no longer legally part of." The Southern war was a war of rebellion, and those waging it committed treason.