This is untrue. It is better to get your vote recorded the first time, of course, but fixing things later is also possible. If regional authorities are made aware of election interference, they can initiate a re-count, refuse to certify the results until a new vote is taken, etc. That’s part of their job.
Is there precedent for casting a vote in the general election after election day in the United States?
The North Carolina example is fascinating, I don’t know how I missed that when it happened. Incredibly, Harris is running again this year since he wasn’t among those convicted.
I’d argue the big difference would be if we’re talking the presidential election, since it’s not self-contained within a state or a city. I’d consider it unlikely the powers that be would let the presidential seat go vacant while they scramble to hold another election, but who knows?