Extended security updates are usually not available for free and are only for Microsoft Customers that are paying for extended support, so we avoid adding them into our content.
I will look into it and get back to you.
The Patch Manager team has yet to perform the technical evaluation so we can not give an official position at this time.
But, from what I have read there will be nothing to stop you downloading the patches and adding them into Software Delivery.
I lifted the following information from a Microsoft document.
37. How will Microsoft deliver Extended Security Updates? Windows Server 2008/R2 instance running on-premises: Customers will receive an add-on Multiple Activation Key (MAK) through the volume licensing portal. Customers can then deploy both the new MAK key and any pre-requisite servicing stack updates, then continue with their current update/servicing strategy to deploy Extended Security Updates through Windows Update, Windows Server Update Services (WSUS), or whatever patch management solution the customer prefers.
The list of supported content is at: https://techdocs.broadcom.com/content/broadcom/techdocs/us/en/ca-enterprise-software/business-management/clarity-client-automation/14-0/supported-patch-content.html
Any additional patches, applications etc. can be added as Software Delivery packages.