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Not a lawyer, but my estimate is that this would stand up in approximately zero courts worldwide

It has been presented as evidence (e.g., https://corrcronin.com/2023/05/never-off-the-grid-how-to-fin...)

All of those examples are of LE claiming that somebody was at a given location, not a defendant using it to prove they were somewhere else.

What's the difference? One is somewhat difficult to fake, the other is laughably easy.

Not saying it hasn't been attempted somewhere, I'm saying it would be a very weak prosecutor who couldn't cast doubt on it as a piece of "proof"

The proof obligation is (correctly) vastly higher in one direction than the other in a US criminal trial.

A defendant using it to create reasonable doubt is a win for the defense. A prosecutor who is only able to cast doubt on it is not a win for the prosecution.

It's evidence. What it means is up to interpretation, but I doubt it would be blocked entirely. It would be up to the prosecutor to challenge the assumption that you and your phone are in the same place, or that there was some other flaw in the data.

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