That is super interesting and i think a nice attempt to do some decent research in this space. The findings are mixed and nuanced as you would expect them to be, and served as a really good reminder that it is all to easy to assume vulnerability, that the individuals concerned do not feel.
Two major, and partially acknowledged flaws are that this has been conducted by a member of prison staff, which is likely to have skewed the results (the scottish prison service is not a neutral party here). Also the prison staff chose who got to participate and there is no detail on how this was done. Both these factors will undoubtedly have skewed the results.
The paper also offers no solutions. If there is widespread gaming of the system, as the women seem to think, how is that managed?