What fascinates me is what is Rossi's level of self-awareness over this? Does he do it thinking this will influence others, or for his own self-gratification, or as a way - he would rationalise - of communicating - or does he suffer MPD and do this unaware of it?
Rossi's character is one of the fascinating aspects of this story. Others will say that he is just an everyday crank with a story, but I don't think his M.O. is that common.
It does seem to be quite uncommon. When reading the comments, I think you just need to ask yourself, "what is the intended goal he is trying to achieve with this?" He's not actually talking to himself. It is for a purpose.
I think to understand it better, you can start with the other fakes. For example, what was the purpose of the fake employee of the the fake customer? What was the purpose of the fake business card? What was the purpose of the fake customer? What was the purpose of the fake transmutation? What was the purpose of the supposed fake test failure with his licensee? What was the purpose of the fake data (36000 kg/day)?
You can start to see the pattern emerge.