Tautology is usually used to denote something trivial. I don't find God revealing His Name, and His Nature trivial.
It's certainly not parallel to the original example given, which if interpreted in the Calvin way, is extremely trivial and trite.
SD
Nonetheless, God reveals his name to us. God’s name is a tautology.
tautology - Logical truth. A statement which is necessarily true because, by virtue of its logical form, it cannot be used to make a false assertion.
How perfect for God, he who cannot lie, to reveal himself. God’s use of a tautology in revealing his name is not trivial, and I emphasized that point by replacing my follow-on use of the word truism by the more appropriate tautology. I AM THAT I AM is a non-trivial tautology.
It's certainly not parallel to the original example given, which if interpreted in the Calvin way, is extremely trivial and trite.
It is parallel in that both Exodus 3:13-14 and 2 Peter 3:9, a tautology is used. 2 Peter 3:9 councils patience (among other things) in the saints. That is neither trivial nor trite.