I have no clue why they collected voter registration data. My guess would be they collect pretty much whatever they can collect and worry about its utility later. The Russians (and all intelligence services) have been known to operate that way. (I laughed when I read Putin questioning that they would surveil every single western business person, even small time chumps like 2013 Trump, visiting Russia. He, of all people, knows they’ve done precisely this for decades.) How do you think collecting voter registration data is useful to advance the goal of modifying the count of votes cast?
I never said the Russians weren’t trying to drive the herd in a specific direction. Clearly they were.