I think the point is that "RISC" should have been "RISC-V". "RISC" = "Reduced Instruction Set Computer", which encompasses many architectures. It's more of an approach to designing an architecture, and encompasses things like ARM ISAs, etc, whereas RISC-V is a specific architecture.

The line "RISC architecture is going to change everything" is a quote from a film (Hackers, 1995) that you're expected to know by heart if you want to be in this treehouse, or something.