The article does actually mention that: “What was left was methodically looted and then razed to the ground by the German Vernichtungs- and Verbrenungskommando

The article does actually mention that: “What was left was methodically looted and then razed to the ground by the German Vernichtungs- and Verbrenungskommando – even as late as mid-January 1945.” Vernichtungskommando is the specific German unit that was responsible for the systematic demolition of the remaining buildings. The other one, Verbrenungskommando, was responsible for the cover-up of the mass murder of the tens of thousands of Warsaw's civilians that had just been carried out by the German army¹. ¹ https://en.wikipedia.org/wiki/Verbrennungskommando_Warschau https://en.wikipedia.org/wiki/Verbrennungskommando_Warschau