Enterprise planner supports SV, SystemC and e functional coverage, as well as code coverage. I think you're looking at an old bit of documentation, as the preferred method is not to read in the testbench code. Instead you start the ncsim simulator once, with coverage enabled, causing it to dump a coverage file. Ideally use the -write_metrics switch to the simulator, and it will write a VSOF file, which you can import to enterprise planner and also to enterprise manager. The planner uses this to show you the implemented coverage so you can map it to the vplan.
Hope this helps.