[tacticalogic]

If I'm reading the article correctly it will affect theories that involve timelines of events in the first few million years of the formation of the solar system, when this is the only clock they have to measure from.

After that, other clocks that are easier to read become available.

[AndyJackson]

I think you understand correctly. It specifically affects theories that involve separations of materials, as the article says. The actual age of the solar system is pretty well established. For instance rock ages on earth are measured by looking at Uranium and its decay products. These half-lives are quite accurately known and not in question.