"Parse, don't validate" through the years with C++

Author has used LLMs to generate Java code in C++. It detracts from his point.

First thought, assuming that birth year starts at 1900 is bad for a number of reasons; one of which, "process this list of authors and ..."

What about everyone born before 1900?

Disregarding the article for a second, has anyone else had the pattern that "parse don't validate" makes sense in object oriented style, but less sense in functional style programming? Like parsing and validating blurs into each other.

C++ could use some do-notation