This is incorrect. Actually, the method used looks a lot like traditional cloning, with some gene editing thrown in:

    The researchers took an egg from one mouse and a special type of cell - a haploid embryonic stem cell - from another.
    Both contained only half the required genetic instructions or DNA, but just bringing them together wasn't enough.
    The researchers had to use a technology called gene editing to delete three sets of genetic instructions to make them compatible.