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meh. i have some old overrevs on my car (and know the exact shift that caused them) and engine is fine. checked the filter for metal bits after and all good. porsche sets the rpm limit where it does because the hydraulic lifters can't respond fast enough at high rpms - the result in an interference engine is pistons meet valves and catastrophe ensues.
that's my car. if i were buying a car with this report i would at a minimum use it as a bargaining tool. again, typically if the engine running fine then all ok, however you can't really trust the oil filter check in this situation as the vendor might be cagey and changing the filter just prior to test drive (been known to happen).
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