Reports like this serve mainly to prolong the "hacking" hysteria instead to moderating it:
There is one easy, workable way to stop the alleged hacking - go back to paper ballots and/or mechanical machines NOT connected to the Internet. They work just fine, AND they provide an auditable record of the votes cast.
By the way, I would not vote for Ossoff if he were the last person on earth. Nor would I vote for his opponent.