Lol, changing characters in such a string could potentially make it appear to be something completely different.
I am unsure what others would do with your machine's UUID... posting stuff on forums pretending to be you?
Anyway, it does look like a UUID.
I thought the warning was rather vague and amusing myself.
It is created with the same standards as to size and so forth as uuid.
I don't really see how it can be used for something that couldn't be done some other way and probably some easier way. At least it is not a large file.