Was the above comment nonsense, or did it have a pattern? If a real person happened to know ten languages and played along in this game with you, would you also see that as evidence that they are not intelligent?
> Kan du comprender questo text? Anata wa quelque inkling habe about lo que se parla dans la presente oraçao? Repondez med sam way of goboriu.
can be translated to
> Can you understand this text? You have some inkling of what is said in this current message? Answer me in the same manner of speaking.
I can recognize Spanish, French, English, Japanese, Russian, Italian, Portuguese, and a couple of words are from languages I don't speak (German? Dutch?) but easily inferrable through their similarity to English.
Not nonsense, just code. If meaning was passed from GP to so many of us, and you didn't catch the meaning, it doesn't make the message nonsense.