From what I've read (the pinned comment in the aforementioned video), he just decided to ditch high resolution voxels for lower resolution ones, as the feedbacks said they preferred a more pixelated art style. But still voxels. But looking at his latest blog post, it seems that he's not focused on voxels at the moment yet. Or maybe got hired and can't talk about it, who knows ¯\_(ツ)_/¯