You seem to have missed the "coupled" in "Lowest unemployment rate since 1969 coupled with negative real wage growth". Neither low unemployment or declining wages alone are indicators that anything is broken. The former just implies that the supply of labor is low while demand is high, the latter implies that the price of labor is shrinking.
But the combination means that there's a problem, because in a free market you would expect the opposite: in times of low unemployment, companies would need to increase wages to attract employees. That this is not happening is a blow against the justification of the current "low taxes, limited regulation" ideology (that it creates free markets), because the labor market doesn't behave like a free market.
But the combination means that there's a problem, because in a free market you would expect the opposite: in times of low unemployment, companies would need to increase wages to attract employees. That this is not happening is a blow against the justification of the current "low taxes, limited regulation" ideology (that it creates free markets), because the labor market doesn't behave like a free market.