This video refers to FM 3-39.40 (Internment and Resettlement Operations).
I did a quick scan of the document and I’m a more than a bit skeptical. There’s the whole “extraordinary claims require extraordinary proof” aspect but there is also this notice:
DISTRIBUTION RESTRICTION: Distribution authorized to the DOD and DOD contractors only to protect technical or operational information from automatic dissemination under the International Exchange Program or by other means. This determination was made on 8 December 2008. Other requests for this document must be referred to the Commandant, U.S. Army Military Police School, ATTN: ATZT-TDD-M, 320 MANSCEN Loop, Suite 270, Fort Leonard Wood, Missouri 65473-8929.
DESTRUCTION NOTICE: Destroy by any method that will prevent disclosure of contents or reconstruction of the document.
That isn’t the proper notification used with restricted documents.
On the other hand a lot of work went into creating the document.
When I can see aerial photos of the camps on U.S. soil I’ll be a lot more susceptible to being convinced it’s real.