All CFWs (except the sysnand-only Pasta series, and PBT) don't use the kernel from the dedicated partitions, but load one from SD.
Most recent ones use the 10.4 one but, to support NTR, many also support the one from 10.2 (which currently is the last one that runs NTR). Your guide probably just recommends the 10.2 one for compatibility reason!