The macros and functions have undergone a lot of changes. PSoC 6 is completely PDL based and hence please refer to the BLE Middleware guide of the PDL to understand the changes.
The logic however remains the same, hence you can implement the same in PSoC 6 but you need to just make use of the right APIs. For example, the function CyBle_GattsWriteAttributeValue() is now Cy_BLE_GATTS_WriteAttributeValueLocal() but both perform the same operation.
The PDL documentation can be found in this path: C:\Program Files (x86)\Cypress\PDL\3.1.0\doc
I recommend starting the project from scratch and writing the APIs manually and not directly using the files from Github. This might be slightly tedious and if you face any errors we are happy to help! Feel free to create new threads for help.