Ok....
So, the Aquatics droped them back in the middle of WWII?
Wouldn't they have been better off going home on their own?
A reman? Could be. Perhaps from a TCW faction where they picked a better plot for the last movie, so the Reman's took over the Romulan gov't. Now they trap Archer in the past to ensure their dominace (I know that idea is full of paradoxes, but since when did that ever stop a good time travel story).
I can't believe they didn't notice the lack of Starfleet tech/buildings. And wouldn't their sensors detect lots of EM/Radio transmissions, instead of Sub-space signals?
Oh, the main reason, IMHO, for the WWII timeslip is the dedication of the Memorial to "The Greatest Generation", which happens this weekend.
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"Yes, it's the Apocalypse alright. I always thought I'd have a hand in it"
Professor Farnsworth