I would assume frame drawn, but back in the day there was ANI to GIF converters. So it could have been done in 3D Studio Max, or Maya on SGI or Lightwave on Ami

I would assume frame drawn, but back in the day there was ANI to GIF converters. So it could have been done in 3D Studio Max, or Maya on SGI or Lightwave on Amiga -> .ANI-> .GIF This by the way, means there could be a way to extract/archaeology dig after the original project file and make a nice 8K render of it.