None of the videos you linked to show any robots actually walking. [1] - the dragon is rolled around on a wheeled platform. There is one clip of a leg lifting,

None of the videos you linked to show any robots actually walking. [1] - the dragon is rolled around on a wheeled platform. There is one clip of a leg lifting, but none of it actually walking. [2] - The Sultan's Elephant is moved around on wheels. It doesn't walk. [3] - That thing is "skating" around on wheels, again not actually walking. [4] - And yet another machine that doesn't walk but actually rolls around on treads.