The capital and the surrounding regions are now practically unaffordable for anyone other than well-remunerated professional workers and those who got in early.
One thing I find odd about the article is the focus on 'being urban', though.
In the US, is it cheaper to live rurally? In the UK that is not true at all in my experience, country living here is aspirational and generally a sign of wealth.
What we have is not really an 'inversion' of white flight; rather, the city _and_ the suburbs are becoming wealthier whilst the poor move away from the capital to surrounding cities (or try desperately to cling on).
Then again, what constitutes a 'suburb' is radically different here!