The error is understandable, the main prototype RISC-V core is written in Chisel and the "Rocket Core Generator" is written in Chisel. The RISC-V team at Berkeley has a lot of overlap with the Chisel team. So it is easy to think RISC-V is all Chisel. I believe
Chisel, Chisel, RISC-V, Chisel, if that makes any sense.
Thank you for the information.