Im not jewish in faith or blood, i'm a Christian and full blooded Scandinavian, but to my understanding Aliyah and Israel as whole has one main core value, all politics aside.
ensuring that there is a home for the jewish people around the world to dwell in safety (to be a Jew can either be your physical lineage, or your faith).
so if you can prove in ...
They don't decide what DNA is Jewish.
The article you link says (their bolding):
A DNA result that “proves” your Jewish origins does not grant the right to make aliyah according to the Law of Return.
To be granted the right to aliyah, you need to show that you are "Jewish or [have] Jewish ancestors within the last two generations" (and that you ...