"Device" refers to the PSoC 6 MCU device selected for the PSoC Creator project. I believe you're building the project for CY8CKIT-062-BLE kit, which has a CY8C6347BZI-BLD53 device, please refer to the following datasheet: CY8C6347BZI-BLD53 . Please note that this is a preliminary version. WCO specifications will be added in a subsequent version.
That helps. Thanks.