Hello Martin,
the ACM paper you're referring to does not represent the current state of implementation in HANA.
It doesn't even necessarily show how stuff will be done inside of HANA in the future.
The paper is about getting a point about certain concepts of data handling.
It's a research paper, not a technical documentation.
Anyhow, to answer your question:
If you specify a table to be stored in rowstore in any past or current release of SAP HANA then the table and its data will be internally stored as rows.
There won't be a delta store, no main store, no compression and no dictionary.
Just the data as rows.
- Lars