Earlier quoted context omitted.
You could always offload some layers to the NPU for lower power use and leave the rest to the GPU. If the latter is power throttled (common for prefill, not for decode) that will be a performance improvement.
Routing in a MoE model might fit.
You want routing to be as quick as possible, because there are dependent loads of expert MoE weights (at least from CPU in most setups, potentially from storage) downstream of it. So that ultimately depends on what the bottleneck on that part of the model is: compute, memory throughput or both? If it's throughput, the NPU might be a bad fit.