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It is true that the guides do wear and once the deviation gets out of spec there is a significant risk of chain slip which will cause the engine to lose time. This is a major source of the quoted engine damage. The chain guides are a maintenance item. At -5.3, I doubt you are seeing any associated performance issues.
If your not seeing any signs of rough running, then your probably just fine. That said these cars are getting up there in age and things like a dirty mass. Air flow sensor and small vacuum leaks cause performance degradation even if they don’t result in a current check engine light. Don’t drive yourself crazy. Look for obvious signs of rough running like idle stability. Then check obvious sources like MAF, AOS, fuel pressure, etc.
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