> The actual conditions to which Jews and others were removed, even prior to the implementation of extermination, was not overt.

That is not correct. Most Jews in Germany were sent to work camps and used as slave labour for local factories. Check out this response: https://www.reddit.com/r/AskHistorians/comments/3mnglz/did_t...

Generally Germany knew, or at least had an idea that something was wrong. Everyone who tells you differently is selling you an agenda.