That said, there has been significant progress in securing elections since the NASEM study was published in 2018. Paperless "DRE" voting machines have become largely obsolete, greatly reducing the attack surface of elections in most states. And statistically rigorous post-election audits are starting to be performed as a routine part of elections in more and more states.
There's still quite a bit of work to do, but US elections have been getting steadily more secure and robust.