I'd say the original photos were digital, edited to the ones that would work for the animation and then printed as tintypes. Would be next to impossible to shoot live tintypes to come out as these did, e.g. consider the exposure times required.
And consider the mountain of film holders cascading around your feet.
Tom, on Point Pelee, Canada
Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...