Dear Mark Zandi... Please Explain This

If Mark Zandi and his "whatever it takes" seasonal-adjusters at ADP are to be believed, the US manufacturing sector added the most jobs in 11 months in December. Our question is simple - with ISM Manufacturing Employment at post-recession lows and US Manufacturing PMIs at post-recesssion lows, and inventories-to-sales ratios at post-recession highs, why are goods-producers hiring at such a frantic pace?

 

 

 

Double-Seasonal-adjustment?