I'm sure that Napoli lost this game on purpose. They are not in the best position in the Serie A standings and they need to keep playing in the Champions League. The Italian Cup is not important for them and they will not waste strength on it. The main thing for them is to improve their position in Serie A and try their luck in the Champions League.
This is by far the most hilarious post I have read here in a long time. Did you know that Kevin De Bruyne injured his upper leg so he can rest until the European Championship 2024? He did it on purpose and now he can take all the time to prepare for the EURO games. Smart move, isn't it?
I don't know how much you know about football, but the national cups are quite important in most leagues and the Coppa Italia is one of them. Thinking that a team like Napoli loses a game on purpose there is fluffy at best.