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.
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.