What do you think of Uranium-lead-dating techniques being extremely reliable?

In order to ascertain the age of the skeleton, Dr Latham, together with Dr Bob Cliff and Jo Walker at the University of Leeds, used a technique called uranium-lead dating. Stalagmite layers contain traces of radioactive uranium, which eventually decays to form lead. The team measured the amount of uranium and lead in the stalagmite layers to form an accurate date for their age and for that of the skeleton.