I think a lot of people are getting confused. By supplement I think people are referring to the STEM Research Supplement and the Arts Supplement that you had to specify you wanted to include on the Common App (this is not referring to the Update Application Form).
Ok, so this shows that there is definitely a difference, because I submitted a research supplement and I still have the table (Status, Form, Date) with the STEM supplement listed under.
r u sure? did u take a look at the picture above to compare? it shud be right above your stem research supplement in header form and right below the blurb saying checklists have been deactivated