Somebody please explain this image to me.

An image from the article, allegedly demonstrating the cooling effects of the device by showing thermal imagery of a person wearing it vs not wearing it.

The colour of the device seems to suggest the lower end of the scale (27 degrees) but the label say 19/21 degrees which isn’t even on the scale? Also, according to the scale the difference between the body surface temperatures doesn’t seem very significant, does it? Why is there no body temperature indicated without the device? It looks suspiciously like I’m meant to mostly ignore the scale and just marvel at the difference between 35 degrees and 19/21 degrees.