Seems like it's doing something similar to sqlfluff lint, even supporting the same dialects.
Also the GitHub link in the docs section leads to a 404.
We've been adding linters, including semantic analysis, in various ai talk2db connectors in loiue.ai that help steer better than normal thin MCPs enable. We've been having to hand roll for making it easy for folks to use splunk, kusto, etc better, so cool to see something like this for sql - we were hoping for precisely that! Our semantic analysis is driven by what's in the DB (schema, ..) x policy controls configurable by team admins, which this does out of the box for SQL.