Freely available arxiv preprint:

https://arxiv.org/abs/1901.06323

I have nothing against science for the sake of doing science, but I’m curious if there’s any wider impact for these results. I see a light atom and “nuclear charge radii”, so does this have anything to do with fusion research?

"The lightest elements play an exceptional role for the advancement of nuclear and atomic physics: Only here theoretical approaches are sufficiently advanced to calculate both electronic and the nuclear structure from first principles."

The purpose of this work would be to get data to subject these calculations to experimental test. In other words, science.

If you mean fusion energy research, the difficulty is more at the engineering level rather than the nuclear physics, and I doubt the structure calculations are relevant to fusion dynamics. There's doubtless interest in the model calculations, but even in the absence of direct applicability of the physics, there's considerable value just in the practice of high quality experimental science. Many things that pass as measurement or some sort of "science" in computing make an experienced experimental physicist wince, unfortunately.

Generally speaking, it is no longer a secret that doing science for the sake of doing science always has a wider impact.