That's still a MITM, albeit a LAN-local one. Non-LAN WAN isn't the total scope of MITMs.
If my computer asks your computer what dns server to use, and you respond with the address of a nefarious one, it's not necessarily a mitm.
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If my computer asks your computer what dns server to use, and you respond with the address of a nefarious one, it's not necessarily a mitm.