Hello. You did not enter the text to which this question refers, which makes it impossible for it to be answered accurately, but I will try to help you in the best possible way.
BIE schools are government plans to prepare to stimulate quality education in indigenous reserves, allowing Native Americans to have access to good education that will promote many opportunities for them and their tribes. However, the execution of these schools has been something that the government has failed to comply with, many of them never left the paper and those that left live with a strong lack of necessary resources.
The author may have addressed this with phrases that point out the problems that these schools face and how it prevents their objective from being achieved.
Opaque means it's not see through, not clear, or transparent
