Hi,
As I know, even if we could disable Windows Update service and task scheduler about update task, a build-in update task will trigger it to run automatically.
So, in fact, it is not available to disable Windows Update totally.
You could try to check on your side for this behavior. We recommend to defer Feature Update up to 365 days. Or defer quality update up to 30 days.
Here is an article about how to configure it;
Defer feature updates in Windows 10
Bests,
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