Hi,
we made this in 2017/2018 mostly.
I just asked Roelof de Vries quickly and it was mainly shot with Sony A6000 + 50mm. (actually, sort of, 24 mp api-c with 75 mm).
Roelof says it should nowadays also work with Zenmuse x7 + 50 mm.
Many shots are done from a drone (that was a Asctec falcon 8) with the above cam set-up.
The first pano is a gigapixel, and was, for a while, the first and most large aerial giga pano ever at that time... as was told me.
Tuur