Many many moons ago I worked as a dipper in a factory that made all different types of tiles. Any tile that fancy was done with a multiple silk screen system. This was done on an industrial scale though and I suspect the moulding process shown above is only for small scale bespoke tiles.
p.s. A dipper is the person who glazes the tiles before the glass firing, or in the case of porcelain tiles, before the combined firing.