Not quite correct - don't put a small tuber into a very large pot. It might stay too wet, especially in your humid climate. The point was the plant isn't flowering size until the tuber is quite large. The people on that list repot their tubers almost annually, and steadily move them to larger and larger pots as they grow over the years.
Aroid roots spread horizontally from the TOP of the tuber, right below the growth point. They don't send roots downward. They don't need deep containers, they need wide containers. The big Amorphophallus become very unstable in tall, narrow containers, because the roots systems can't extend horizontally far enough to support the tall leaf. This plant stays short but it likewise will prefer a wider pot rather than a deeper pot. Commonly grown tuberous aroids include genus Amorphophallus, Arum, jack-in-the-pulpit (Arisema), calla lilies, Caladiums, Dracontium and what was called Sauromatum (voodoo lily.)
I would put that 2" / 5cm tuber into something like an 8"-10" azalea pot, lower than a standard pot of that diameter. If I only had standard dimension pots I'd use one 4"-6" in diameter. I would water once, lightly, without soaking all the soil. Some aroids are rootless during dormancy, and other retain some roots. I don't know about this one, and I don't know when it normally makes new roots.
I would keep it very cool through the winter, and water once a month. Once it begins growing begin watering and fertilizing heavily.
It will go dormant when it gets hot next summer. This might be early and might be late. I would stop watering by late August if it hasn't started yellowing, and let it go dormant.
With good growing you will move it to a larger pot after the 2019 growing season.
Habitat photos show them growing in full sun through grass. The grass keeps the soil cooler but the leaves need full sun. You should probably mulch plentifully and keep sun off the pot. I wish I'd done that.
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