Answer
For IBM i workloads, yes ... IBM's platform support details and S1112 limitations page position the server for IBM i Software Tier P05 only. That is the important commercial point because it shapes IBM i licensing assumptions and often affects third-party software economics too.
That does not mean the whole machine is only for IBM i or only for one kind of workload. IBM also says Linux, AIX, and VIOS partitions can use remaining processor and memory resources on the same server. Buyers should read "P05 only" as an IBM i boundary, not as a whole-platform boundary.