When they get three down, they'll have about 37 to go. Right now it's about 40 to zero for an old earth. I doubt that they intend to ever address, much less make any serious dent in, the real evidence for the age of the earth.
The scientists who wrote these pieces are making a coordinated effort to present at least three decay chains (isotopes) that indicate a young earth.
It's not that coordinated, they are not using the same methodology. It appears that the other two are location-based, which is one of the things that the link that Vade posted refers to. Just because it's odd in once place, doesn't make it odd in all.