Okay, for the record, Des Sherwood and I dislike one another to a fairly great extent, so I am not one to defend him in any way. I found that little story at his website. I
do know he is a guitar teacher, and if the sound bites he posts are really him playing, then he is a decent player. He is also very dedicated to his RR.TK site and I find it hard to believe he would risk the reputation he's built for himself there by posting a fictitious story online. Mr. Sherwood's site can be found
here , the Ozzy story is towards the bottom of the page.
As for Ozzy calling himself "Ozzy", I've never met him, so I wouldn't know. It does seem that if Ozzy was going to call someone unannounced he would call himself Ozzy, because that is the name he is known by. To call a guitar player and say, "Hi, this is John," would have meant nothing to the person on the other end of the line. So it makes sense to me.
I understand your skepticism on this subject. I was skeptical the first time I read it, too.