Ah yes, the SQL injection cycle begins anew. A solved vulnerability for decades, only for the new generation of junior devs to ignore wisdom of the old generation again and introduce it anew.
Don't ever do this. Query builders exist to sanitize inputs in a failsafe manner. SQL has so many pitfalls that tools like sqlmap [1] exist for a reason. You will never be able to catch all encoding schemes in a regex approach to filter unsanitized input.
The examples in the blog can be exploited with a simple id set to "1 or 1=1;--" and is literally the very first web exploitation technique that is taught in highschool-level CTFs.
sqlx can mitigate a lot of problems at compile time, but sanitization is completely ignored in the post, and should at least be mentioned. If you recommend to juniors that they don't need a query builder, tell them at least why they existed in the first place.