Indeed, but for centuries it has only been used as a pronoun when referring to a non-specific person. The usage like in the article is only a recent phenomenon

Indeed, but for centuries it has only been used as a pronoun when referring to a non-specific person. The usage like in the article is only a recent phenomenon [1]. [1]: https://en.wikipedia.org/wiki/Singular_they https://en.wikipedia.org/wiki/Singular_they