There is no PSoC5 inside the PSoC6.
A PSoc 6 consists of
- ARM M0 CPU
- ARM M4 CPU
- Components as listed for the selected device specs
- a lot of glue logic
so far there are no Del Sig ADCs offered for PSoC6, you'll probably need to use an external part.
I think he means the PSoC 6 development kit with the CY8C5868LTI-LP039 PSoC5 chip used for Kitprog2.
You should be able to use the ADC on that, providing you change the kitprog firmware.