This document relies strongly upon Transact-SQL:

https://en.wikipedia.org/wiki/Transact-SQL

A more universal industry standard is SQL/PSM, which originated from Oracle PL/SQL:

https://en.wikipedia.org/wiki/SQL/PSM

Demonstrating the flaws in question in the PSM standard would be more useful.

You can in fact show the same flaws in PL/SQL or whatever else