interesting. Based on that, it looks like the sticking point really was whether the Emperor's safety would be guaranteed (thought he was eventually kept as a figurehead, it's not clear the US leadership expected to take that path.)
EDIT: that said, do you have a source that isn't a holocaust-denial website?
Ugh, yeah, that's a terrible source. Apologies for the bad Google-fu.
I have heard this claim from decidedly less-terrible sources, but the hour is too late in my current timezone to pursue this thread. So until then I will need to relax the certitude of my claims.
EDIT: that said, do you have a source that isn't a holocaust-denial website?