The multicore is only close because the RISC-V one has twice as many cores and uses twice as much power. That would suggest the RISC-V cores are getting around pi3 levels of performance which is a decade old and losing badly as perf/W.

The first one might not make sense but it gets them the pipeline for when it does make sense in the future. Plus for a lot of things using LLMs they'd be fine with older tech, especially if running it was even faster and cheaper.