I read the abstract for the article, the full text is $30 some. I also read Chris Kresser's response. I have done a bit of research on the authors and here is what I found.
All three authors work for a private medical clinic, Breakspear Medical Group in the UK specializing in the treatment of allergies and environmental illnesses.
Dr. Jean A Monro is the medical director of the group who has a personal vested interest in treatment of environmental illness. (Don't confuse her with the JA Monro that works for a major New Zealand Agri-Corporation! I did at first and was developing a whole conspiracy theory about the study.)
Professor Basant Puri is a part-time researcher and consultant with the group.
Ron Leon is the clinical nutritionist manager.
Here is a link to the website: http://www.breakspearmedical.com/
From what I can tell, they are earnestly concerned with helping people treat afflictions such as celiacs, autism, IBS, chronic fatigue syndrome, and much more. The company is family owned and operated by the director Jean Monro and her (brothers?). They have also set up a fund to help low-income people receive treatment for allergies and env. illnesses. Here is a quote from the "history" section of their website:
Dr Monro's areas of special interest undoubtably were influenced by her personal life. Her husband suffered migraine, Coeliac Disease and symptoms of Multiple Sclerosis (MS) later in life. Her two sons have Coeliac Disease, and had early childhood eczema and experience migraine. Wanting to find the best treatments for her family drove her to carry out research into micro-nutrition and treatment of allergies involving thorough investigation into the chemical building blocks vital to the efficient functioning of the human body. (Some examples of these essential building blocks are vitamins, minerals, amino acids, enzymes, essential fatty acids, and bioflavinoids.)
They seem to value alternative and nutritional approaches to treatment. They have doctors, an acupuncturist, and clinical nutritionists on staff.
That is all I came up with so far. I am not yet convinced to throw the bone broth out with the bath water. I thought Chris Kresser's response was well reasoned, but I guess I do not feel completely at ease either. I think that my next step might be to write to Alister Monro, Managing Director, directly. Maybe he can shed light on the funding for the study or how they will incorporate the finding into their own clinical recommendations. But I am out of time for now!
Maybe together we can keep tabs on this issue and continue research into the nuts and bolts of the original study. It could be helpful to know how the study was funded and gather a bit more information about lead poisoning levels. It is definitely a topic worth following as many of us religiously make and consume bone broth.