I also had never heard of it until now but did just like Harris and read several articles.
Even the papers that praise its potential benefits advise caution in terms of length of training and amount of weight used. The paper that Harris links has the precaution at the bottom that recommends against this method in the case of an impaired vascular system. This is often an impairment that people may not be aware of.
If there is any benefit here, the risks seem to outweigh it by far. It is not surprising that this is linked to the bodybuilding community which is usually known for a greater risk tolerance in pursuit of the training edge.