How well would this work in a hot, humid environment? He mentions that having a vent at the bottom is essential for getting cooler air in which makes sense, but I live in a place where it's also very humid.
Humidity affects the final equilibrium moisture content [0] of wood, but even at 100% relative humidity it’ll eventually stabilize at around 25-30% MC (green wood is usually >60% MC, for reference). Humidity averages around 65% in the areas of the US where most of the timber trees grow, at that humidity EMC will be around 12-15%.
[0] https://en.m.wikipedia.org/wiki/Equilibrium_moisture_content