These are tiny homes that are built in a shop and just dropped onto the little concrete pad once they're done. A small crew was able to build them out over time, so I can't say which option exactly is cheaper. One advantage was they were able to move people in as they were built too.
Edit to add a word
As I understand it, immigration is always a balancing act. We have a demographic problem in Canada. As more boomers retire there needs to be workers to take their place and pay taxes to fund services. Many critical industries are experiencing a labour shortage and those jobs need to be filled. Their isn't enough young Canadian citizens to accomplish this. Immigration can't just be stopped.
More immigrants will put pressure on the housing market, but the lack of housing is the result of decades of government complacency, as well as support for Canadian housing as an investment vehicle. The amount of houses/housing we need right now is huge. So huge that the current amount of construction workers in Canada cannot build it quickly enough. Immigrant workers will be needed. Undoing the decades of damage done to housing in Canada will take a sustained, long term, and bold effort. Does the current government have the will for that? I'm not super hopeful. Politicians have vested interests in keeping the housing market 'strong'. I hate to be fatalist, but even if the government does everything right, I don't expect the cost of housing to decrease any in the medium term.
Unfortunately, I don't have answers, besides the obvious that immigration policy needs to be nuanced and strategic.
That's my view of things anyway. I invite anyone to criticise and share knowledge on the subject.