Depends on where in Canada. Toronto? Vancouver? Montreal? Oy, insane real estate prices. Bumfuck, Alberta? Manitoba? Rural anywhere? Much cheaper.
And regardless of the price I could afford the utility and maintenance on a condo or apartment in a major city in Canada (if I could ever afford one) much more easily than on a castle in France. Not a great comparison.
I can’t say for sure, but it certainly seems like the people believing these things speak in ways reminiscent of people with delusion disorders (e.g., schizophrenia). The patterns of how they use words and concepts just feels very delusiony to me.