There is so much wrong in what he said here.
Del Neri = 1
Players = +25
25>1
"I am playing".
No, you are not playing. The players are playing and you need to find the best possible formation for the players at your disposal instead of sticking to the only formation you know.
Really, did his formation bring him glory or trophies? Why stubbornly stick to it then? If it's the best one that suits the players then keep it, if it's not then do not force it on Diego or Del Piero or others who are better players than the coach that you are or ever will be.