This is would be wrong. The version specifies the desktop-entry-spec form Freedesktop.org. There is no 0.10 version, there is however a Version 1.0. This version has nothing to do with the version of the application this starter starts.
Use a Theme with an application icon matching the name gephi or add this icon to your Theme.
There’s nothing wrong with the desktop file, just a couple harmless warnings:
❯ desktop-file-validate gephi.desktop
gephi.desktop: warning: value "Application" for key "Categories" in group "Desktop Entry" contains a deprecated value "Application"
gephi.desktop: hint: value "Application" for key "Categories" in group "Desktop Entry" does not contain a registered main category; application might only show up in a "catch-all" section of the application menu