I have asked friends to read the address too and they had some doubt regarding a 9 which looked a bit like a 4 but nothing else, but they agreed that it was a 9 after close examination. I will refer the court to case 681 (https://court.kleros.io/cases/681) where similar ambiguity was resolved with the address checksum (see page 5 of evidence https://ipfs.kleros.io/ipfs/QmagTPvSJ1pM7Tt1gvZwqnuEUQ7WXyDymv1E5uBjoxdy4H/roman-cadre-evidence.pdf). I have tested all possible combinations of addresses, including the most improbable, here: https://web3playground.io/QmQt2UbB8WXbo4SqdGZHq6izLQN8JG5kKW8sJMRVwRES8U (click the "Run" button for output) and only the correct address has a valid checksum ("true"), meaning that there is no way the submitter's address could be interpreted differently.

The checksum test code for reference, in case the website is offline:

async function main() {
  const cartesian = (...a) => a.reduce((a, b) => a.flatMap(d => b.map(e => [d, e].flat())))
  return cartesian(["0x4"],["f","7"],["A"],["b","6"],["f","7"],["F8129f"],["9","4","1"],["d31"],["9","1"],["9d98B4a28e9A2d3c3E2d33A5"]).map(a => [a.join(""), web3.utils.isAddress(a.join(""))])
}