In May 2019, the Investor Program Office held an I-526 “reset training” for adjudicators. I now know some of the content of that training, thanks to a Freedom of Information Act request (followed up by a lawsuit, because USCIS apparently didn’t want to release the materials). IIUSA has been promised 2,000 pages from its FOIA request, and has so far received about 500 pages.
IIUSA has chosen not to make the adjudicator training materials publicly available. The materials are available as a member benefit in the IIUSA Member Portal