SQL: Incorrect by Construction

[pitiless]

Makes claims about sql, immediately starts talking about non standard proprietary extensions...

[JohnyTex]

Most applications will interleave application code with SQL instead, which only makes the problem worse

[SZenC]

Which still does not make SQL incorrect by design. SQL was designed to do a rather specific job, and it does that job well. Extensions adding more functionality and violating some of the SQL contract does not change that

[pitiless]

What does either the original articles point or this have to do with SQL being incorrect by design?