Surface winds are given in magnetic headings.
In contrast, winds aloft forecasts are given in true headings. They are not adjusted for DENALT.
Indicated airspeed (IAS) is the measurement, subject to instrument error. Indicated airspeed is really just a dynamic pressure reading.
Calibrated airspeed (CAS) compensates for instrument errors.
True airspeed (TAS) is CAS adjusted for air density (pressure and temperature). TAS does not take into account winds, and therefore is not a true ground speed.
Surface winds are given in a ground relative flow of air, and are relative to a magnetic heading.
Winds aloft are forecast and reported in an airspeed, and are intrinsically based upon the ground relative flow of air, and are relative to a true heading.
Therefore the AWOS/ASOS/tower reported surface winds are not in TAS, as that term is defined as being a vehicle vector magnitude.
However, when at Leadville, CO, (KLXV) the measurements of the airflow are relative to a datum slightly above the ground, and in that sense are analogous to the true airspeed of an aircraft if it were flying stationary above the airport. But TAS is not the correct term. It is simply a surface wind velocity and the corresponding magnetic directional heading.