Yes I see your point, in fact sociological variables are becoming less important in explaining party choice. But in the end, as the previous study showed, policy reversals would in principle be more frequent in countries in which pivotal groups of voters are hostile to liberalisation.
Edit,
Anyway, our experience does not provide a "model" that can be simply applied to other countries, however illustrates how individual countries can work in a direction contrary to the neoliberal orthodoxy.
In America, taxing the rich smells like communism,