Endpoint Security Extension removal by root

Last I checked the uninstall command only works if you disable SIP:

 
% sw_vers
ProductName:            macOS
ProductVersion:         15.2
BuildVersion:           24C101
% systemextensionsctl list
1 extension(s)
--- com.apple.system_extension.network_extension (…)
enabled active  teamID          bundleID (version)                               …
*       *       SKMME9E2Y8      com.example.apple-samplecode.QNE2FilterMac.SysEx …
% sudo systemextensionsctl uninstall SKMME9E2Y8 com.example.apple-samplecode.QNE2FilterMac.SysEx
At this time, this tool cannot be used if System Integrity Protection is enabled.
This limitation will be removed in the near future.
Please remember to re-enable System Integrity Protection!

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Did you check the new uninstall functionality in Sequoia System Settings?

The right to change these switches is com.apple.system-extensions.admin