You are so right in that CA Telon release 5.1 does not deliver the CA Telon Test Facility.
Please see our informational solution, RI16359:
Due to the constraints of its underlying architecture, the CA Telon Test Facility is no longer being supplied or supported as part of the product. We recommend you consider CA-Intertest Batch for your debugging needs in batch and IMS programs.
So, while the CA Telon Test Facility from release 4.1 has not been tested or certified under z/OS 1.13 and will not be, we do not recommend using CA Telon 5.1 with the older, although latest, version of the Test Facility from release 4.1. We recommend CA Intertest Batch.