Question on "change in the information in [my] application"

Hello,

Prior to my second semester senior year (this semester), I anticipated taking a certain course (a non-requisite elective) at my school, and marked it as such on my RD applications. When second semester actually began (after the RD deadlines), I found I didn’t really enjoy the course and ultimately decided against taking it (I go to a high school that operates with a university and thus has a period to add and drop classes). However, I forgot to notify the schools I had applied to of this change.

With acceptances coming in, I’m seeing statements like (this is Duke’s) “If there is any change in the information in your application - including academic, personal, disciplinary, or legal matters… you must contact us within 72 hours.” Would my counselor have sent in a midyear report including the information for my finalized class schedule for this second semester (which would exclude this dropped class)? Would it be necessary to contact the Duke admissions office, notifying them that I ended up dropping this course, or would they already know of this change?

Thank you!

I would notify them just to be safe