Based on my experience with IFP, I would suspect that it will also include Regulations and Airport Procedures.
Since the FAA have still not completed converting all Knowledge Test questions to the ACS reference format, there may be inadvertent inclusions, as well as ‘wider definitions’ of what is really on the paper.
Also with the reduced number of questions, there is a greater prospect of a fail, with fewer incorrect answers.
Since the Private database is relatively simple, as is the Instrument alone, I would recommend reviewing the full test prep for each. While not the most comprehensive databanks, I found the ASA iOS apps more than sufficient.
Good luck.