Hi Salvatore,
The “Polarimetric” and “Soil Moisture" are provided by the RADARSAT Polarimetric Toolkit (rstb).
It seems this is not installed on your system. At least it is not shown in the log.
Have you disabled it during the installation process?
You can get it after installation by the plugin manager.
Go to Tools / Plugins. In the Available tab you probably find the entry Radarsat Polarimetric Toolkit Module. Install it and do a restart of SNAP. Then the menu entries should be back.
In my installation it is already listed as installed.