Ally Tool in Blackboard

Ally Tool in Blackboard

Our teams that work with curriculum had a few questions:

Is it possible to learn more about the validity/reliability of Anthology's Ally tool? I see they have a Help Center but we need an account to be created by our Anthology representative. Even better, would it be possible if I or someone from my team could meet with an Anthology representative?

Do the Accessibility standards get updated periodically? When was the last time?

Also: Is it pretty effective for determining if the tag tree structure of pdfs are accurate? 

These questions came up after I noticed some discrepancies between the CACWT accessibility score and the PowerPoint accessibility checker for PowerPoint slides. I will attach the PowerPoint slides for reference. When I reviewed these slides with the PowerPoint accessibility checker, it flagged multiple important issues to fix (missing Alt Text, subtitles, unique slide titles). This same document received a 100% score in CACWT. This confused me as these issues usually get flagged in CACWT.  Could this be a quirk of the system?  A one time mistake? 

Also: Is it pretty effective for determining if the tag tree structure of pdfs are accurate?