The brep geometry imported into Revit loses the stitching between surfaces (see here for info on what I mean by this), as Revit doesn’t handle BREPs the way Rhino does. In fact from what I can see the Rhino model doesn’t handle breps the way you are asking - notice the initial rhino object in the Rhynamo node is a polysurface not a solid.
Out of curiosity (I’m not a Rhino user), do you have a volume when you select this as single object in Rhino?
I tried this a second time with Revit 2018.2. This version of Revit imported the geometry correctly, which was readable by Dynamo as well. Filtering so I got only the solid resolved the issue for me. .
If it’s not that it may be that the geometry didn’t import correctly in your Revit version. I question the version as my previous attempt was with 2017.2.3 which is where I got the “could not import all geometry” error. What version are you in? Can you post your .rvt if this doesn’t work?