Broken in this context means being able to determine the input nonce that generates a hash with enough leading zeros to mine a bitcoin block with much less ener

Broken in this context means being able to determine the input nonce that generates a hash with enough leading zeros to mine a bitcoin block with much less energy and time than brute forcing random nonces does now. Then you could mine bitcoin blocks with no power expense and always be first. You would have to be careful about how many blocks you mine to not make people suspicious.