Copying the questions to put the responses inline.
Does the Auto-tag API set the PDF UA document property (in any situation)?
No. PDF/UA requires human verification for about 1/3 of the criteria. Because of this, we won't set the metadata automatically.
Do any of the Acrobat Services APIs set the PDF UA document property?
No.
Is there any connection between the PDF UA document property and the actual accessibility of the PDF or is it just a flag to indicate the document should be accessible?
It's just a piece of metadata. See image below. The author is responsible for it being an accurate representation of the level of tagging in the file.
Does the Accessibility Checker report on whether the document is PDF UA compliant? AFAICT, it doesn't.
It reports which machine-verifiable criteria pass, which fail, and what needs to be human verified.
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