How do you check if you don't have any other view into the data but SQL and you don't know SQL?
Same way you do today; you trust whoever wrote the query.
I do not sell a wrapper on top of some LLM; you can absolutely write your SQL directly. There is an engine, there are iceberg tables. You can just live your best life doing your own SQL by hand.
Now if you couldnt do it before and you have a sensible understanding, you can likely do a bit more with the CLI tooling. And if you know a lot more, you can still do that. The queries are not hidden, or abstracted, If you need them they will be saved - transparently in SQL.
So I dont know what is the answer to the question "how do people do things they don't know how to do" ?
Sql takes at most an afternoon to learn enough of to navigate a database with