I hear what you’re saying, but my original point was that even in 80 years, accepted syntax, vernacular usage, and general language construction can change quite a bit, so the OP post isn’t that odd. It’s still “intelligible,” and, indeed, language does change. Quite often, in fact.

When I said “nearly unintelligible,” I meant it hyperbolicly to accentuate the fact that the modern language being highlighted by the OP is, similarly, not unintelligible. They are just examples of relatively new language use.

I was highlighting the second sentence due to its modern syntax and the ways many of the words have grown to encompass broader meanings.

Believe it or not, it didn’t even occur to me that “cool” was a slang word that might have shifted in the last 80 years, it’s so deeply embedded in my own idiomatic language that I was using it in that sentence as the word with historical stability in the sentence.

Though, now that I’ve looked into the etymology, the usage in that sentence would also be a bit odd 80 years ago.