They wouldn't have to delete all the records. Just enough. Give enough people provisional ballots so they think their vote was counted. Only need 78k votes in three key states to flip the tally. That's barely a blip on the radar of votes. Less than a thousandth of a percent of all votes cast. In the noisy data, you wouldn't need much disruption to pull this kind of thing off.

We need to know if they successfully penetrated PA, MI, and WI's registration data. If they did, there's a chance the totals are suspect. They've acknowledged the penetration of 21 states. We know Illinois and Arizona are 2 of those states, bringing the suspects to 19/48.

Assuming a random distribution, there's a 5% chance that all 3 of those states were compromised. I doubt the chances are random, and we don't know the actual security of each states' vote, but if there's as a high of a chance as 5% that election was compromised, we need a full audit. We shouldn't be comfortable with this. 21 states having their totals potentially compromised by minor registration data alterations in such a close election is a big enough deal that we need to investigate.