If someone is not, not a user, but familiar with ALGOL, Simula, Pascal, Modula, Ada, PL/M, Smalltalk, Eiffel, and Oberon, they should not really promote their programming language ideas as relevant...
The fact that they use some "new languages" (e.g. whatever derivative stuff happens to be in fashion atm) and are not even aware of the debt of those languages to the list above, doesn't qualify them...
Just because you're an old programming elitist that is familiar with completely out-of-use (and most not even maintained now) languages doesn't qualify you, either. I don't gatekeep book authors by their knowledge of the ancient Sumerian language, and anyone who tries to do so would rightfully be laughed out of the room.
> If someone is not, not a user, but familiar with ALGOL, Simula, Pascal, Modula, Ada, PL/M, Smalltalk, Eiffel, and Oberon, they should not really promote their programming language ideas as relevant...
If programming is intellectual onanism for you, then sure you're free to entertain that idea.