Well to be fair, if you rent even a cheap apartment, you are likely going to have a fridge, dish washer, stove, maybe a shared washer and dryer.
An old CRT TV can be had for free. I’ve seen plenty out on the side of the road with Free signs.
A decent garage sale hunter can get a computer, DVD or microwave for a few bucks. Phones too if you are willing to pay for the service.
But then again there is a difference between poor, and thrifty and those that are leeches shopping at Best Buy.
So while a low-income person in the U.S. has nothing on real poor people around the world, I don’t see it as weird that someone considered “poor” here would have any of those things.
I’d say A/C is an good indicator and then, narrowing the measure, central air. Those two, particularly central air are still luxury items for poor households.