an article from ars says it is the full instruction set

The resulting processor involves 5,900 individual transistors and is capable of implementing the full 32-bit version of the RISC-V instruction set, which necessarily means it includes sophisticated circuitry like the RISC-V instruction decoder.

https://arstechnica.com/science/2025/04/researchers-build-a-risc-v-processor-using-a-2d-semiconductor/