Many Problems
The question of spontaneity is "What started the fire?" Whether a furnace next to "a man" (unreferenced) was absolutely "impossible" to have started combustion is irrelevant. The furnace must have been demonstrably non-functional at the time of the accident for the cited conclusion. Why would one be messing with a furnace that's not working...to start it perhaps? Wouldn't he then naturally be carrying an ignition source, lighter or match?
What could have started him on fire? Is it more plausible he passed out trying to start the fire with a match or lighter, or that his acetone levels did something never detected once in hundreds of accidents and zillions of deliberate attempts?
Neither Ford's video, nor his quote have anything to say about ignition, purportedly the topic of the article.
Yes, overweight people who are simultaneously impaired and ignited can burn, but there is not a cornflake of evidence in this article of ignition from undiscovered internal chemical reactions.
