The model wouldn't learn to use blender, that'd be inefficient. It would create a voxel object then upscale the voxels into a proper 3D model, then exported in Blender format.

The bits are already there in various research papers. We know how to take a text prompt and generate a small voxel model. We know how to take a voxel model and upscale it into a large voxel model.... All that's missing is somebody to assemble the entire thing and enough budget for the 7 to 8 figures training cost.