The BL Touch on the Qidi X-CF Pro is very close to the hot end and can get damaged by the heat. This shield provides protection.
It also makes it much easier to transfer the BL Touch between extruders because it replaces the two 2mm thick washers under the BL Touch which are a pain to line up.
Print with a high temp filament such as eSun's PACF.
Install as shown in the picture.
The author hasn't provided the model origin yet.