Does it stop spying on me?  

When I set to "0 - Security [Enterprise Only]" in gpedit.msc, does it stop spying on me and does it stop data collection? I am using Windows 10 Enterprise LTSC version 1809

That setting is defined to the right of your arrow at - 0 (Security).

f23948 said:

When I set to "0 - Security [Enterprise Only]" in gpedit.msc, does it stop spying on me and does it stop data collection? I am using Windows 10 Enterprise LTSC version 1809

They are not spying on you, they collect data that improve Windows Ten.

Otherwise, not really, you must complete by disabling the service responsible of data collection and its derivatives in settings. You run an older version, we don't see allow telemetry as you do in GPEditor, only Data Collection. It does the same and sends basic data.

-You should see AllowTelemetry set to zero + DoNotShowFeedbackNotifications set to 1: Regedit tweaking telemetry instances

Code:

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\DataCollection

-Is Diagnotics & Feedback in system settings greydout (privacy)?
-Disable Connected User Experiences and Telemetry in services. Check that service now and then, more after CUs.

In order to turn offl Diagnostic & Feedback, run this cmd line admin in powershell:

Code:

reg add "HKLM\Software\Policies\Microsoft\Windows\DataCollection" /v "DoNotShowFeedbackNotifications" /t REG_DWORD /d "1" /

This one kills activity history > Settings > privacy > Activity history > telemetry greydout:

Code:

reg add "HKLM\Software\Policies\Microsoft\Windows\System" /v "EnableActivityFeed"  /t REG_DWORD /d "0" /f

Windows is not the last, Ten has many capabilities to collect data and bypass all sorts of tweaks. They even have robots capable of recognizing a set of telemetry IP addresses blocked in the firewall or in the Hosts file.

Settled that way you should be good, don't push your luck too far and unless you know what you're doing, avoid privacy apps.