I was referring to the OBJ file! 
So, I’ve run the file through a debugger against the PraxisLIVE source code (it’s what I have handy 
and the obj loader is the same code as Processing). And there’s a very obvious flaw - the OBJ file has no faces. All the vertices are parsed correctly, but the OBJ loader creates the actual PShape children from the faces data. I believe that Blender has vertex and faces views - I assume you’ll see nothing in the faces view?!
Your best bet at this stage is probably parsing the file manually into a single PShape.
This is kind of what @jb4x was getting at earlier, except explains why you can’t access the vertices in the resulting shape.