I have (we call them 'journals'). While medicine isn't my field, this kind of study needs a comprehensive methodology to rule out all other causes, which is lacking in this paper.
For example, there are some pictures of feet having different temperature before and after. But that needs a control to account for whether the subject has recently stood up or sat down, because blood flow varies with blood pressure - if the patient has been standing for a while, blood tends to collect towards their feet, which may vary the temperature seen on a thermal camera.
If you say 'we observe X' and 'X is caused by Y' you need some evidence of causation, not just that Y was the first hypothesis you thought of.
Also, I note the declaration:
"Preparation of the manuscript was aided in part by funding from Barefoot Sales Corporation, and the author acknowledges a financial interest in this company."
and I note:
"EarthFx the parent company of Barefoot Sales Corp, DBA Earthing.com holds the following registered patents.
Patent 6683779 - Personal Body Grounding System Patent 7212392 - Personal Body Grounding System Instrumentation and Process Patent 7724491 - Method Of Treating Inflammation and Autoimmune Diseases"
So the paper is effectively an advert for the author's company.
Theo