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Are you referring to https://hoi4.paradoxwikis.com/User:Bitmode/Launch_options? Those are just all the options I found in the code but not all of them necessarily do something (anymore). As far as I can tell there is no correct way to use -mod=. The launch option is recognized but does nothing in 1.9.3. In older versions the parameter was probably the relative path to the mods descriptor file, i.e. -mod=mod/ugc_741805475.mod.
Now with the brand new nodejs launcher blob, you have to use its json files. The enabled mods are read from Documents/Paradox Interactive/Hearts of Iron IV/dlc_load.json: