Experience with ANDI being used to review course

Has anyone had experience with the AI tool ANDI being used to review their course?

We have a 3rd party vendor that we must go through and they have recently started using this tool.

Unfortunately, it is flagging issues that we have never encountered before and are unsure how to solve.

Errors noted:

1. A graphic was flagged as not having alt text when there is a text box with 0 opacity provided that contains alt text. ANDI also says the image is decorative only, when the image does not have the Empty ALT Tag box checked.
2. ANDI noted that "Tables used for layout purposes should have the ARIA [role=”presentation”] attribute. Otherwise, data tables should include the proper accessibility markup and table header <th> cells."
3. We are unsure how to solve this. The entire course does not have a single table. What are we supposed to do? How do we fix this?
4. What is the ARIA attribute?
5. ANDI says, "The course modules use iFrames that are missing title attributes."
6. We don't know what they are talking about.  
7. ANDI says, "There are 3 <div> elements on this slide that misuse the [alt] attribute meant for image elements."
8.  It goes on to say, The [aria-label] attribute can be added to div elements to provide text alternatives for the video content within.
9. We are unsure how to fix this or even what it is.

Any advice or personal experience would be appreciated