Hi Anthony,
the key sentence in the KB article is
"For entry-level platform models, only internal disks are partitioned."
The FAS2552 system is classed as an entry-level platform.
I assume that internal disks are the disks in shelf 0.
If you subsequently add disks to a raid group that contains partioned disks, ONTAP will partition the new disks.
Other than that, there is no way that I'm aware of that you cam manually partition disks.
Hope this helps,
Michael.