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.
If Napoli is still trying to improve its position in the Serie A standings, of course Napoli must always consider winning and it would be very unreasonable if Napoli deliberately lost the Coppa Italia to a team lower than them. Apart from that, Napoli also cannot give an excuse if they deliberately lost just because they are still in the Champions League this season, because their fans will certainly be very disappointed if Napoli admits that they deliberately lost a certain match even though it was outside of the Champions League competition.
I think a team will always want to win, even if they are competing in a competition that is not their main target. But the problem is that they lost to a weak team, even though when comparing strengths, they have better strengths than the team that beat them in this match.
I think they should realize that winning is important in every match, no matter if it's in a big competition or a competition that is not the favorite. They are not in a good situation right now, in Serie A alone they are struggling to maintain their form. And if I relate it to their overall performance this season, then I'd say they're in a downward spiral that they're losing.