Hi Joe
That's correct. Under HANA there is no need to delete/rebuild indexes, as there are no "traditional indexes" on the HANA platform. Also the flat cubes under HANA does not need this kind of process at all.
The creation of such process steps is also no longer possible in a HANA system. There is also the note 1636545, which describes this. The generated calculation scenario for such flat cube behaves as if it would be a BWA index (Converting Standard InfoCubes to SAP HANA-Optimized InfoCubes - Modeling - SAP Library).
br
Roland