I'm sure there were fire tornadoes before the age of carbon even began. Some people don't seem to realize that huge areas of the North American forest used to burn unchecked every year, and accounts of life a century ago include the routine appearance of choking smoke clouds in the late summer and early autumn.
In fact the term "Indian summer" comes from the observation in New England that warm, dry weather in the autumn was often accompanied by smoke which they attributed to the reputed native American practice of burning grasslands to spook bison herds for hunting. The point is that a lot of burning was a normal part of the annual experience, whether their analysis was correct or the smoke was actually from forest fires.
In the Providence weather journal, in the hot dry summer of 1854, Caswell refers to "very smoky with much reduced visibility" several times.
My guess is that these huge fires in 2020 and recent years are part of a cycle and of course it does not help that there are some cases of arson and human carelessness involved, but on the other hand, in past centuries, similar years would have come to their conclusion only when winter rains set in. The native population had no resources to fight fires and were totally at their mercy, having to move hundreds of miles in some cases to get out of harm's way. Our modern lifestyle keeps us more fixed to locations, and those locations are continuing to spread out into the forest boundaries as suburban and exurban living appeals to more and more people. It's great having a few big trees, wide open spaces, and nearby forest in your back yard until a forest fire comes over the ridge, then you are about where the fire can most easily accelerate forward.