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Update: Car is back to normal. Replaced the thermostat and the engine coolant temperature sensor. Kind of dumb that the ECT sensor is a bit buried - on most other cars, its much more easily accessible, but I think the real problem was the thermostat anyway. I replaced both parts just in case...

That's about the time I worked as a call center rep for Comcast. Based on what I saw and heard from the reps around me, you are spot on (unfortunately).

https://mazdas247.com/forum/t/mikes-2018-cx-9-signature.123866784/page-15#post-6825964

Location of the ECT sensor. The thermostat housing is just to the left. Unclip the ECT sensor and the connector just above it to make room for your 19mm deep socket and ratchet. A note on these connectors - they're "squeeze and pull" connectors, but you want to squeeze closer to the "middle" of...

Got everything all sorted out with the engine overheating issue on Friday evening. I drained the coolant, then replaced the thermostat and engine coolant temperature (ECT) sensor with brand new Mazda OEM parts. Refilled with the recommended 55/45 Mazda OEM coolant. Mileage on the car is almost...