According to comments on the above video, someone asked a gaffer who said the whole thing was shot on FX3 and Oren Soffer said this on Twitter:
"We can’t share any technical info JUST yet but promise we will spill all the beans when the film comes out! All I will say for now is just a reminder that any rando can edit IMDb and despite our efforts to contain it the info up on there isn’t accurate, so, grain of salt! ;)"
Not sure why all this mystery around what was used but I sense this should make headlines if/when it is officially revealed that the whole thing was shot on the FX3.