It is a word, it’s just often misused.¹

1. m-w.com/grammar/supposably-vs-supposedly

If you have a problem with the way Jesus authored The Star-Spangled Banner, then maybe you should move to France: La Marseillaise doesn’t allude to slavery or take pride in Americans committing treason against their leader in London.

It is a happy coincidence that the evening before the 1970s began, at 4pm Pacific, they decided to invent UNIX.

This is an excellent find.

I was even more excited seeing that there’s a fledgling Resolved section for stuff that’s no longer unknown (1 so far).