People have been making qubits in the form of nitrogen vacancy (NV) centers in diamonds for quite a long time. See, for example this

https://arxiv.org/abs/quant-ph/0510152

from 2005. No idea what these Canberra people are doing that is different/special, but the general ideas are quite well trodden ground.

for details of their technique: https://iopscience.iop.org/article/10.1088/1367-2630/abb0fb/...