The implication is that the leak is indeed inside the condenser coil or in the air handler.
While either the condenser or the air handler can be leak repaired, most HVAC guys are going to say that it's cheaper to replace either one than it is to try to repair it. Whether or not that's the case depends on how good the explanation is from the tech (or how much you trust the guy), but taking apart a condenser and replacing the coils is difficult as it is, not counting the fact it might not even be possible to get the part.
That being said, chances are good that only one of the sections needs to be replace, not both halves.