The people of the city that I talk to refer to this section as a multiuse path. The material (concrete) that it is made out of has no effect what modes are allowed to use the path (for example the multiuse path along Jubilee is made out of concrete). I also frequent the space both on bike and foot and by vehicle. The multiuse path on the west side of the Maryland Bridge is a cycle + foot path on osm right now (I haven't touched it), so what you said is incorrect. As for portage and omands the last edit to that was 9 years ago, likely before that section was designated a multi-use path so pointing out a section of the map that needs to be updated provides nothing to your argument. I read the two pages that you linked but I don't see anything that supports your argument in them, would you care to point out the specific sections in them that support you?

You've changed the type to sidewalk, but the city page I linked clearly says that bicycles are allowed, and so the access type for bicycles of "not designated" is clearly incorrect.