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The chipset's chassis intrusion circuit requires an external switch to enable its full and proper use. No such switches are provided in the NUC systems, however. Bottom line, you can just ignore this status; it is meaningless. There are ways to reset the circuit if you wish (search the web for "tool to clear chassis intrusion"), but there is no guarantee that the intrusion status will not just reassert as a result.
Hope this helps,
P.S. Glad to see someone using AIDA64; it is a great tool and well worth the money.