Is there any evidence any of this data has been available - let alone been used - for a campaign in any of the states that do preprocess mail-in votes? Because doing so in order to shift a few ten thousand votes would leave quite a bit of a trace.
How would we know? But ultimately it doesn’t matter. This is the first election with near universal mail-in ballots, so no prior election would have had the coverage necessary to make this data useful. Secondly, just because it hasn’t been done yet doesn’t mean it won’t happen in the future. The point is to proactively prevent possible election manipulation, not merely react to demonstrated problems.