PyCharm does not know what RhinoCommon types are. For example your list contains Rhino.Geomery.Brep but PyCharm does not have a way of knowing the type members so it can autocomplete for you.
The way this is usually done is through “stub” files (.pyi file extension):
See here for how to use stubs in pycharm
If you are using Rhino 7, you can use this python package that contains stubs for RhinoCommon 7:
If you are using Rhino 8, launch Rhino and run the ScriptEditor command to open the editor. Python 3 inside of Rhino will start creating stub files and will place them under:
%HOMEPATH%\.rhinocode\py39-rh8\site-stubs
You can point PyCharm to this directory