This article needs to be re-named. Dew point is ambiguous. There are two phycial properties that are closely related Dew Point Pressure AND Dew Point Temperature. The article clearly is speaking of the latter.
When one says "the dew point" it is often correct to assume that the dew point temperature is being spoken of, however, this is not always the case.
In addition the dew point temperature of a gas or vapor is dependent on the absolute pressure of the gas - that is to say: dew point temperatures must always be refrenced to a pressure and dew point pressures must always be referenced to a temperature.
The article doesn't explain or ellude to this important relationship.