I find this story to be implausible. The text is both understandable, has whole words and both Caps AND punctuation. Therefore we can safely conclude that no teenager wrote it and, in my experience, it is very unlikely that such a text has every actually exited.
Sounds like you’ve already responded like I would have although I would probably drive 35 miles to see the result of Green Bean’s idea.
Years ago, our oldest son would sometimes accidentally call us on his cell and we would be able to listen in on whatever party/converstaion was going on. My wife was quite surprised by the trash that comes out of a young man’s mouth when he thinks only some other guys can hear.