First, a nice video of a pig cremation:
Make sure to watch to the end. It turns out that some uncremated flesh remained after the pyre had finished burning.
Second, an article on another pig cremation:
The pig was 100 kg. The wood used was birch – 2 cubic meters of it – but this proved an insufficient quantity, and dead wood scavenged from the surrounding forest had to be used to finish the job. The pictures at the following link give a detailed look at the sequence of events in the cremation:
It’s hard to say just how much fuel was added, but the failure of the initial supply of wood to complete the cremation suffices to support the revisionist case. One can make a rough estimate of the weight of the initial fuel, given that the wood is probably one of the following two species: