That one is still in use. We used one like it for a very long Picket Fence. But online, all I could find was hydraulic ones or gas ones, and those didn't have a picture for illustration.
Even so, unless you have one on a tractor mount or a huge one like the miners had...they will still only dig a 6 in. hole one at a time.
It is absurd to think that Ricci, or anyone else for that matter used a Post Hole Digger to dig a grave.