Minecraft is just pixels in space. The world is built with a sort of very low resolution voxels. Yes, the 1m x 1m blocks that make up everything are voxels, they only have position (discrete, aligned to the 3D voxel grid) and "colour" (the type/material), and don't have dimensions nor rotation. That is prety much the textbook definition of a voxel. The fact that when rendered they are given texture is a rendering detail that doesn't erase the fact they are voxels.