I sincerely doubt this.

For one thing, it is nearly impossible to change player names via clients on the fly in that manner. You would need some extensive memory-editing or client-based hex editing type tools to do anything like that, and you cannot modify the netcode to display different values of connected players at all. If such an event occurs, you might want to send me a screenshot of it, although I think this is some throwoff to make people stop playing JJ2. If this is indeed true, I will look into this.