Why are reprobates still Calvinists?

Tyler Vela is a "Calvinist" who has rejected Christianity and Calvinist affirm that he accurately understands scripture and Calvinism and Christianity (from their perspective).

But he is unsaved and Calvinists also affirm that.

This contradicts Calvinism which asserts the unsaved cannot understand spiritual things.

Why do some who reject Christianity still hold to Calvinism being the only way to understand Christianity and many Calvinists affirm this?

Reviewing https://www.youtube.com/watch?v=jBrVxHi9hKs
and https://www.youtube.com/watch?v=CbsdcullyCw
and we'll point you to https://www.youtube.com/watch?v=pjNSkn0-W2Q

And we'll point out 1 Cor 2:14 and the Calvinist interpretation that contradicts their acceptance of Tyler's understanding of Calvinism.