In those instances, were there also declines in real income, employment, industrial production, and wholesale-retail sales? In the current climate, are those things declining? Maybe the answer to those questions help explain the discrepancy.
I don't have the time to link the other stats, but they're not so rosy either, except employment. One good stat and several bad ones is still a recession.
So it seems safe to say that real earnings are indeed decreasing, rather than regressing to some past mean.