I'm not sure "primitive" is the right word. They're using concrete(*). They're using locally sourced materials that would be free. They're using their own labour and tools they made themselves from locally sourced materials. So they would have a decent house well suited to the local weather which cost them no money. Is that more or less primitive than spending 25 years short of money to pay for a house or a lifetime short of money to pay for rent or, increasingly common in this country nowadays, never being able to afford a house of your own? I wouldn't do it because I like having plumbing, sewerage and electricity, but I'd hesitate to call the building itself "primitive". Also, those things could be added to some extent although you'd definitely need modern technology for electricity. Not necessarily grid - solar panels and an array of batteries would probably work quite well in that part of the world. I don't know where they are, but that vegetation is not what grows in a cold climate.
* I haven't watched the earlier videos in the series that presumably explain it in more detail, but given that they're using it like concrete, it acts like concrete (note the temporary supports at the base of the roof - the stuff obviously sets over time) and the building is referred to as "Roman" in the description, I'm assuming that it's Roman concrete. Lime mortar and aggregate - give it time to absorb carbon dioxide from the air and you've got very strong stone, i.e. it's concrete.
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be cool if there was a series of them, need like bronze age and the other ages as well.
That wouldn't be significantly different in the context of building things. The tools would be more durable, but that's pretty much it in this sort of context until you get much closer to modern times. Even as recently as late medieval period, metal wasn't really used in housing. Latches and hinges and some items inside houses, but nothing structural. Not even in places like England, which was rich, organised, well developed and had lots of iron ore and many skilled smiths. Bronze and iron ages even less so. Decades back, the BBC did a series in which volunteers lived with only late iron age technology for over a year, isolated in an iron age village. In an interview afterwards, one of them commented that it would be more accurate to call it wood age because wood was the main material, with iron (actually steel, despite the name) being used almost entirely for working wood.