Hi,
ESUs are still included with Azure Stack HCI 22H2 so long as you are using Azure Benefits.
Starting in 23H2, Azure Benefits is now called Azure Verification for VMs. Azure Verification for VMs uses a new attestation process which is enabled by default in 23H2. The original attestation method used by Azure Benefits in 22H2 is now referred to as 'legacy OS support' which can also be enabled in 23H2.
Hope this helps!