I think it sounds like a scam -trying to make out they are caring dog owners.
Why would they be rehoming an 11 week old puppy? surely you'd know if your cirumstances were likely to change that much.
I think there is most likely no actual puppy or if there is then it's puppy farmers with an elaborate cover story.

E-mail back and ask if the mother can be viewed with the puppy, if they sat no and/or ask for money up front then you'll know 100%

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A dog Possesses Beauty without Vanity,Strength without Insolence, Courage without Ferocity, And all the Virtues of Man without his Vices.