There are several binary packages provided by the ifcopenshell package:
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ifcopenshell0 Open source IFC library and geometry engine - binaries & examples
libifcopenshell-dev Open source IFC library and geometry engine - development files
libifcopenshell0 Open source IFC library and geometry engine - shared libraries
python-ifcopenshell Open source IFC library and geometry engine - Python bindings
You grabbed the binaries package, which is required by python-ifcopenshell, the package you want... except it's not the Python 3 version, so in order to get this to work you'd need to install the python-ifcopenshell package as well as Python 2 version of FreeCAD. Eventually, the package will be updated to also provide a python3- binary package, which would also resolve the issue.