They seem to give the church too much credit! The motivation claimed in the report is that the mormon elite need more wives for when they die and get their own planets!
I suspect that the Russians have trouble grasping the notion that the data is sought for purely informational reasons, so that the visitors to the 150+ temples have new names to work with. If they actually grasped this, they might be more motivated to earn USA money for the information.
In one instance, the church was dinged for 'giving' equipment to an archive, when actually the equipment was only being loaned. If the church bit the bullet and gave the equipment away, it's likely they'd have had complete cooperation.
I'm wondering if it's a miscommunication between Russian and English translations?
To my understanding the baptisms for the dead are to give the deceased spirits the 'opportunity' to accept the 'gospel' in the afterlife if they didn't here in their earth life. Not to marry them to otherwise already married deceased Mormon males.
The temple work proceeds to do the baptisms, then endowments. Which might include sealing married couples together with their children. But not seal a deceased post-humously baptized person to someone else already deceased if they weren't married in earth life.