Oh brother. I’m sure most of the European world has some Jewish descendants somewhere in there blood line. Hell, even Hilter did! Why is that a big deal? As if having some Jewish descendant makes everything you ever did a Jewish accomplishment.
I don’t think anyone besides a few Spanish and Italian ultranationalists are interested in claiming Columbus’s “accomplishments.” Any evidence of Columbus being Jewish is mostly interesting for anthropological and historical reasons, not chest-beating ones.