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.
Unfortunately, if you don't see an edit button on the comment then you can't edit it anymore. But props for admitting you're wrong and trying to correct it :-)
https://riscv.org/wp-content/uploads/2015/01/riscv-rocket-ch...
https://github.com/freechipsproject/rocket-chip (parametric SoC generator, Chisel)
https://github.com/ucb-bar/riscv-sodor (Chisel)
https://chisel.eecs.berkeley.edu/