Probably had a friend do it for him
The entire local Amish community now comes and helps him tend his property, raised him a barn.
I am unable to find the video, but here is an interesting story: https://www.npr.org/sections/money/2013/02/25/172886170/a-co...
They offered to pay me for my time, but I refused as I'm happy to help my neighbors. They seemed pretty uncomfortable with me helping without anything in return, so they pay me back in discounted products or labor of their own.