[ChevyGuy]

So, oddly enough, when they went to perform the update/recall, the computer said I already had the proper version.
The service writer told me they’ve only had to update a few, the majority they’ve seen are already “updated”

Did you get a second letter saying it was available? The letter in the first post said it wasn't available yet.

It sounds like the ECM doesn't detect a fault condition, so it seems unlikely to affect anyone's experience unless they had a fault and didn't know it.

 

[ChevyGuy]

Just the one letter saying my car has been recalled for emissions and needed software update.
My service papers said it had the correct update already installed.

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In that case, I suspect that the update hasn't come out yet. You may not have the "correct" date, but rather, the most current version - so the dealer can't do anything. I'd wait for the second letter.