That is interesting. If true, it would be the first GNU/Linux derived OS to achieve UNIX(™) compatibility. Whether Linux distributions could trivially be made compatible has been a hypothetical debate so far ("nobody wants to pay the licensing fees.") It would be big news to see that borne out. Hopefully more details will become available.
Nit-picking: the statement that these two things are orthogonal is much stronger than the statement that they are such that neither implies the other. The latter is compatible with a high degree of correlation; the former is not.