It’s the space after the colon in the submission title (was that the infamous HN title normalizer?). The original has SQL:2023, which makes sense if you know that the ISO naming scheme introduces the year with a colon (e.g. “C99” is officially ISO 9899:1999, “C95”—that is ANSI C plus wchar.h and wctype.h—is ISO 9899:1990/Amd 1:1995).
It made perfect sense to me at first but now that you mention it, the title is quite funny. I guess if "SQL" says 2023 is over, who are we to argue - happy new year everyone!