The AS/400 nowadays is called "IBM i". The note says IBM i is affected: "AIX and i operating system patches will start to become available February 12".
Since the mid-1990s it has run on POWER so if POWER is affected it obviously would be too.
Since the mid-1990s it has run on POWER so if POWER is affected it obviously would be too.
Also, if it is exploitable from Java, nowadays the IBM i JVM is J9, almost the same as AIX. (This used to be different – the "Classic JVM" was integrated into the TIMI infrastructure, so quite different from JVMs on other platforms.)