Does D2L have a way for the instructor to access my submission while it appears "unread"? My school uses D2L for all classes. When I submit a paper (or other file) to D2L, I can see in the "Dropbox" whether or not the professor has read a submitted file. In most of my courses, I see the indicator change from "unread" to "read" and then I see the grade posted.

I have one course where I've been receiving grades without every assignment being changed to "read". This course is led by a professor who is... I'll say, less than enthusiastic about the course.

While this is a general education course for which I'm not expecting any significant feedback on my work, I am concerned that this professor is forsaking grading assignments altogether and simply providing an A.

Does D2L have a way for the instructor to access my submission while it appears "unread"?

Should I address this? If yes, with whom?
I don't know about D2L specifically, but some software can have issues with properly recording whether some has been read. It is possible for example with some systems that if someone has Javascript not enabled they may be able to  read a file without getting recorded as accessed. 

That said, if this isn't happening, the best thing may be to talk to Department Chair, and ask them to keep your concern anonymous. This will help minimize the chance of blowback/retaliation to you since the individual will not know you were the one who complained.  It may also make sense for similar reasons to wait until the end of the semester before talking to the Chair.