Exactly. There's nothing wrong with performing songs a little different than they were written. It's silly to think that an almost 40 year old person can sing or sound exactly the same as they did when they were 23. To be frank, I'm impressed he still can perform some of the Hybrid Theory songs after all this time. Those songs are nearly 20 years old.
Don't listen to him! Withstand the daemon! Renounce him and listen to the almighty guitar god Brad, whose hands will lay on the iridescent chords of the golden (acoustic) guitar!