These two statements are predicated on the concept of "guilty until proven innocent". There may be problems in the use of less-lethal force, but the study does not appear to have any relation to the crimes being investigated, nor the statistical analysis of who is committing crimes, including which crimes. Disproportionate interaction numbers is not necessarily caused by Police actions. It can also easily be caused by the actions of those who are disproportionately interacting with police.
I will let Mr Fryer answer you:
You can see his detailed report at the link below. Some it is heavy with how the statistical measuring is done, but you can see for yourself if he covers your questions or not; if the conditions you mentioned are covered or left out.
https://scholar.harvard.edu/files/fryer/files/empirical_analysis_tables_figures.pdf