It means how much of the sqlite test suite it passed. They were just measuring correctness, not performance or memory consumption, where of course Zig should win.

But the aim of that experiment was measuring correctness of llm written code in different languages, so used sqlite as a benchmark considering it's fairly complex software with a comprehensive test suite. It is not suggesting that because a language scores better on that benchmark it'd be better suited to writing the next sqlite, due to obvious other factors like performance...