I disagree. The SNO could have tried to migrate their nodes and misconfigured the target path. It’d be better to let them know something is wrong, so they can face-palm themselves and solve the issue.
If the node does return data that proves to be invalid, then it’s different: considering each file is identified by some kind of UUID (if I’m not mistaking), I guess that if a node were to target a folder containing data from another node, it shouldn’t find a single file matching requests coming from satellites. Which means that a node returning wrong data probably is cheating. That’s my take anyway.
As @BrightSilence said, there is room for improvement indeed, some may want to upvote one of his suggestions to make the software more robust: Make the node crash with a fatal error if the storage path becomes unavailable