Yes, that is correct. There is currently no support for PSoC 64 devices on ModusToolbox. This was the reason I asked for details regarding the source of your PSoC 64 device. From your post on the thread - Re: How to create new PSoc Creator 4.2 project with CY8CPROTO-064S1-SB prototyping kit, I got to know that you got the CY8CPROTO-064S1-SB Kit from Hochschule Darmstadt University for a project. Can you please provide more details regarding the project and the entire program through which you received the Kit?
We will be supporting PSoC 64 devices soon. Please stay tuned for that. But for now, you can use mbedOS for developing applications on PSoC 64. You can learn more about it here - MBED OS 5.14 RELEASED WITH PSOC 64 SECURE MCU SUPPORT
Hope this helps,
Thanks and Regards,
Rakshith M B