DAX Cobra cooling

[HDCobra]

Recently acquired a DAX Cobra and confused about the cooling pipework, hope someone can advise. The two small bore water pump ports that would have been the cabin heater matrix supply and return on the Range Rover the engine was originally fitted to, are not required on the Cobra. These have been piped together and connected to the rear port on the Edelbrook inlet manifold. I have attached a schematic, with the pipework shown in green.

Connecting the heater supply and return together doesn’t make any sense to me ?

https://ibb.co/VcC94GVN

https://ibb.co/DDCPDm6M

https://ibb.co/NgRB26pH