Hi @kong.yang,
How I read it is that this does not imply that Celonis cannot be used to extract data from on-premise SAP systems altogether. You can still use Celonis for process mining and analytics on SAP data, but the setup and support will no longer come through SAP. Instead, you'll will need to work directly with Celonis to manage the process mining solutions, including integration with SAP systems.
Considering that on-premise SAP systems will stop support in 2027, it is most likely the reason why the reseller agreement did not continue.