Clarification needed about the definition of non-text content and "programmatically determined"

[A11yTea]

Hi everyone,

I used to pass images who were coded as decorative (meaning they had a null alt attribute) as long as there was visible or invisible text that made the image redundant. But now, I re-read the definition of "text alternative" and I see that the concept of "programmatically determined" is stressed.

In addition, the definition of "Decoration, Formatting, Invisible" looks like it does not cover redundant information either.

Would you fail an image under 1.1.1 Non-text Content if it was coded with a null alt attribute but had a descriptive caption that contained all of the image's information?