Out of curiosity, do you have any idea why screen readers appear to read elements so differently? Like, it seems ridiculous that has so many different interpretations (would you not just read it as “datalist”?). Would you recommend using a different method instead to ensure consistent reading like the ARIA implementations?
Side note: good article. I don’t think referring to an item as a drop down is a 100% bad thing in conversation because people are roughly familiar with the general concept of one (e.g. the whole ‘oh a dropdown, I know that!’ stick customers will inevitably do), but I think it’s important to be as specific as possible and to explain what you really mean and what specific element you’re using, especially when defining requirements.