The linked page says "Holes are drilled or sawed into offending snags - standing dead trees - that threaten mayhem upon sawyers felling them by conventional means." in relation to the photo showing dynamite inside a cutout in the trunk.
Help me out here, why would this be the preferred approach? Seems to me the benefits of using dynamite are outweighed by the risks. Can't tell much from the narrow view in the photo, but from what you can see, it looks like it could be felled conventionally without difficulty.
It would also seem it would take longer to properly (safely, etc.) rig the dynamite, connect the trigger, run the wire, etc., than it would to just drop it.