That is true of any DC-coupled amplifier and there are many such.
The definition is wrong, however: a capacitor in series with the signal, a DC-blocking capacitor, is a coupling, not decoupling capacitor. A decoupling capacitor is meant to decouple (isolate) the voltage from any AC signal and so is typically found in the power supply. The DC filtering capacitors in a power supply are decoupling capacitors. The series capacitors in the signal path are coupling capacitors used to pass through AC signals whilst blocking DC.
HTH - Don