Jamshed Damkewala writes on devblogs.microsoft.com: Starting in December 2020, we will be delivering .NET Core updates on Windows via Microsoft Update. We have received many requests for this, particularly from organizations that acquire and manage all of their Microsoft-related updates via Microsoft (or Windows) Update. This change will enable organizations to manage .NET Framework and .NET Core updates in the same way. If you don’t want to use Microsoft Update to update .NET on your machines, you don’t have to, and can continue using one of the existing options.
Applications using the Framework Dependent Deployment model will benefit from .NET Core updates delivered by Microsoft update. There is no change to apps that use the Self-Contained Deployment model, these apps are still responsible for keeping the runtime updated.