The DCS feature was discovered in a recent Linux patch and it looks like it is designed specifically for laptop GPUs, even though it is supported on the high-end RX 6800 series, as well as the upcoming RX 6700 mid-range models. DCS reduces power consumption by turning the core off when thermal and power limits are exceeded.
https://www.notebookcheck.net/Linux-patch-reveals-AMD-s-RDNA2-GPUs-support-Duty-Cycle-Scaling-power-management-feature-for-ultraportable-devices.517409.0.html
Navi23 is certainly not an 'entry level GPU solution for ultraportables and tablets'. It is a powerful, almost a PS5 level GPU. Even the Navi24, with just 64-bit bus (but still very capable with 24CUs), is not for tablets, although this GPU certainly could be used for powerful ultraportables. For tablets and ultraportables, Van Gogh is with RDNA2, and designed for very low power (lets hope we will see devices with it).