You are still using a voting machine, but you've just introduced a shitty paper input that needs to be scanned into the machine. The counting machine is a voting machine. It can be hacked.

The only benefit is that you have a paper record that can be corroborated if there is evidence of hacking later. But we could do a printout paper record on voting machines too.

You'd be surprised how many of those paper ballots don't get recognized when they are counted. Because the checkmarks don't fill up the box enough or because of optical/scantron error.