This problem with black point cloud occurs when you are using grayscale point cloud. If you use colour (i.e. include photography during scan - I don't know how exactly it works) - it looks absolutely fine.
There is also German Add-On for for advanced point cloud import into ArchiCAD. Called BIMm Tool. There I think they solved this problem.
https://bimm-gmbh.de/en/portfolio/bimmtool/