I watched the video but the walls looked like they couldn't support the weight. It's a death trap. I did read about people having concrete roofs in Guam for hurricanes.
You have a point..I doubt the location is a place that has building codes, let alone codes to enforce.
Interesting time lapse cabin build... https://youtube.com/shorts/ONUE4xbRTtQ?si=nc-hBJDhKg00Kiwm And water wheel https://youtube.com/shorts/iI53SPkZjyk?si=2f9V-2qJpmTxrlIx With running water, a water wheel and a shaft..a number of mechanical tasks are achievable, saving human sweat and energy.
A small wooden hut and corn flour mill... https://youtube.com/shorts/Cb83lANaXCI?si=fNLTDbELwplRIvP9 https://youtube.com/shorts/_CHodsl1Nwg?si=ehXzipX2QvVM_PfV
Bicycle Camper... looks like a nice project. His plans and construction instructions are availabe as downloadable files...at a modest price. Temporary Obsessions by Paul Elkins - Elkinsdiy