You can't use green wood to build anything you expect to last and you certainly can't just shove it into the ground and expect it not to rot. It's interesting intellectually but completely impractical.
It is a bit more nuanced than that. I agree you have to understand how your building materials will age but it doesn't necessarily make things impractical. In a rain forest, green wood lasts a lot longer than you might expect. There are villages in the Amazonian rain forest with similar construction (not tile but mud and thatch) which have lasted for a while. In part because the wood cures slowly, and in part because things like the roof are typically replaced periodically.
It would probably be worthwhile for him to watch his materials over time and adjust as needed in terms of prep but I expect his 'hut' would certainly last the season and maybe two or three.
Given that he has his kiln set up, he is now in a position to actually build bricks for a more permanent structure, presumably that is his next video if he is working through the Big Bad Wolf hand book (hut made of sticks, hut made of mud, hut made of bricks :-)
You use that to build the shelter that you stay in while you're building your real house. Then you use it as a storage shed until it falls down.
Temporary structures do have practical value. That's why we have scaffolding. Architectural soundness may take some additional time, and you may not want to sleep in the mud surrounded by bugs for the entire duration.
Depends on a wood. The traditional Caucasian huts are made of the fresh, wet willow, sand and the fresh goat dung. Once this hellish mixture settles it stands for centuries.
