total guess
maybe he meant that even though there is a certain level at which yeush acts similar to hefker, truly there is no complete yeush because a human being, no matter how hopeless and even impossible it seems, still has an attachment to his property and on some deep level still thinks hell get it back, something like that.
or if were talking about yeush as in giving up hope in life, maybe he meant something similar to what i conjectured about property.