All these mods are not for 1.13.2 as you can see on their filenames.
There will be no mod finished yet for 1.13.2, as forge deploys the beta version just 2 days ago...
I managed to solve this myself. Just start up Eclipse and point it at an empty workspace. Then Import - General - Existing projects into workspace, and point this at the base folder where you unzipped Forge and performed the set up (i.e. where the .project file is)