I think it's not an untenable position with a sufficiently preserved specimen.
You mean specifically a human or any cryogenically preserved organism?
A human but certainly small mammals. Organisms have already been brought back so there is no question as to that aspect.
Which organisms have been brought back?
Worms, tardigrades, etc
Were these worms, etc still alive when they were cryogenically preserved?
Actually they were naturally preserved. They were frozen then thawed out basically.