WSUS Offline Update is not Windows Update. The Windows 10 Package (KB 2990214?) is pushed through Windows Update via GWX (Get Windows X (=10 in Roman numbers)). GWX itself is KB3035583.
If you uninstall and hide KB3035583, the Windows 10 package should stop being offered. And please note that WSUS Offline Update does not contain those optional updates.
Here's a list of KB packages that are more or less taking part in that Win10 'offer':
- Code: Select all
wusa /uninstall /kb:3083711 /norestart
wusa /uninstall /kb:3083710 /norestart
wusa /uninstall /kb:3083325 /norestart
wusa /uninstall /kb:3083324 /norestart
wusa /uninstall /kb:3080149 /norestart
wusa /uninstall /kb:3075853 /norestart
wusa /uninstall /kb:3075851 /norestart
wusa /uninstall /kb:3075249 /norestart
wusa /uninstall /kb:3072318 /norestart
wusa /uninstall /kb:3068708 /norestart
wusa /uninstall /kb:3065988 /norestart
wusa /uninstall /kb:3065987 /norestart
wusa /uninstall /kb:3050267 /norestart
wusa /uninstall /kb:3050265 /norestart
wusa /uninstall /kb:3044374 /norestart
wusa /uninstall /kb:3035583 /norestart
wusa /uninstall /kb:3022345 /norestart
wusa /uninstall /kb:3021917 /norestart
wusa /uninstall /kb:3014460 /norestart
wusa /uninstall /kb:3012973 /norestart
wusa /uninstall /kb:2990214 /norestart
wusa /uninstall /kb:2977759 /norestart
wusa /uninstall /kb:2976978 /norestart
wusa /uninstall /kb:2952664 /norestart
You can save that list as a .cmd file and executa as Administrator, to uninstall those packages. Might need to be run multiple times, as some updates might have more than one version installed.
ts;dr: No, the packages to get Windows 10 are not contained in WSUSOU. But the GWX package has been offered by Windows Update as 'Important', hence many users got it installed automatically.