Does ThermiRF have the potential to cause facial fat loss?

The short answer is yes. Some modest injury to adipose cells (fat cells) can occur at temperatures as low as 45 degrees Celsius.  The tissue effects of ThermiRF should be viewed as complex and are the combined result of depth of treatment, tissue temperature and the duration of treatment. It is certainly true that an experienced user can target specific effects in the skin (dermis), subcutaneous fat and the skin's fascia's attachments by controlling temperature, depth and treatment time. However, it is best to think of skin tightening as a measure of overall "tissue contraction".  Tissue contraction involves the skin but also some of the deeper tissues such as subcutaneous fat, fascia and septal connections.. Hope this helps. 

The science of temperature-induced connective tissue contraction, collagen induction and fat reduction is well worked out. The temperature needed to produce fat loss is much higher than what is used to only produce tightening.  The physician decides what they want to accomplish per location on the face or neck, and the respective temperatures are set for that goal and the internal temperature is closely monitored to ensure that the deep tissue doesn't get heated more than it should.The information provided in Dr. Shelton's
answer is for educational purposes only and is not intended
to constitute medical advice. The information provided should
not be relied upon as a substitute for consultations with a qualified
health professional who may be familiar with your individual medical needs

ThermiRF definitely has the capability to cause fat loss. Depending on the treatment settings and the location of the probe, different tissue effects (tightening vs fat reduction) can be emphasized, but there is no way to 100% guarantee that only one of the two effects will be achieved. Therefore, it’s very important to apply this technique appropriately and in consultation with an experienced cosmetic dermatologist. In particular, be cautious about applying ThermiTight to some facial areas since facial fat loss is usually not a pleasing result and there are also additional elements of anatomy such as nerves and blood vessels that need to be accounted for.