I understand that they have better security than SA, but those overseas houses in the article look dated and depressing.
The benefits are a lot more than just security: Career opportunities, life style, culture, education, travel (2 hours to Paris or 4 hours to Amsterdam by train if you're in London), etc. The entire world becomes more affordable to you there.
As for the houses they show, well a lot of that is because the authors are ignoring all the realities of overseas living. Such as, the increased salary, and much lower interest rates. One also doesn't buy a house in say, London as a first home, since in any dense city, even the crappiest houses are expensive - you buy a flat, and it if you're making an ok living, it will be very nicely appointed. Also, culturally most urbanites spend a lot more time out and about, rather than in their homes, so they have different spending priorities. Alternatively, one can look outside of London/Amsterdam/etc., and get a lot more for one's pounds.
Another observation is that they are showing professional SA photographs (filtered, minimal, staged, etc.), while for the overseas ones they're choosing cluttered pictures, taken by amateurs - especially for the cheaper ones.
The universal constant, is that in a free market you get the value that you buy/sell for. Individuals have subjective valuations, but the
mean valuation is exactly what it's traded at.