The singularity in this context refers to the point beyond which predictions will fail because we cannot possibly foresee the consequences of certain technological changes.

There's nothing historical about it; it came about as a result of a few different science writers looking into the future and wondering how we keep up in an accelerating technological context.

I actually agree that it's become something else, but the origin of the term was what I was correcting, and its origin isn't something woo-woo, it's firmly based in scientific speculation.