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Ok, so I'm still chasing this issue.

I finally got the dealer to admit that all they did was scan for codes. Their excuse for not doing more tests is that GM policy is to stop if no codes are present.

Based on what the dealer is telling me battery degradation would only be warranty-able if there were other trouble codes present. However, that is not what the warranty states, it says "degradation beyond 35% is covered" not "degradation beyond 35% when associated with another trouble code is covered."

Also, the manual has a disclaimer that battery testing can take 24 hours but does not make that statement for other warranty items which leads me to believe there is a dedicated test for battery testing.

I have forwarded this information to my caseworker at Chevy HQ. I am now asking for clarification about the warranty and the test required for battery degradation. I have asked for documentation one way or another because I either need it to convince the dealer to test my car or to show it to a lawyer. Because if they are refusing to assess my battery degradation then how are they able to satisfy their warranty agreement?

I plan to provide any official guidance I get from GM here so that if others need it they can skip this excruciating process.