It could also be a pre-prepared disk image.

Or dont connect to a network during setup and do this.

OOBE mode.

1. Ctrl+shift+f10 or shift+f10
2. Type: start ms-cxh:localonly
3. Create local account

Finish initial windows boot, then follow up with O & O shut up 10 at minimum before connecting to a network.

Then there is the fun of going through the task scheduler to remove telemetry.

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