It's not just from that 1 game that we can say that Nunez's performance has improved now, it's undeniable that Nunez's performance was very good in the match against Newcastle and he became a hero for Liverpool with the 2 goals he scored that made Liverpool gain 3 points in that match , but let's look at Nunez's performance in the previous match.
I think Klopp knows better what is best for his team, whether Nunez will return to being a super sub or should he be included in the starting line-up or playing regularly from the first minute.
Of course it's not like that looking at the quality of the players because one match has not put an answer regarding the player's ability to consistently be at his best. But there is a much more probable reason for playing Nunez in the early minutes, because seeing the strategy implemented by Jurgen Klopp by placing Cody Gakpo as a center striker did not make their game appear optimal. We can see how Liverpool played against Bournemouth and placing Cody Gakpo in the midfield position actually revived their game and the midfield also dominated the match strong until in the end they managed to score three goals in that match.
It is clear that Jurgen Klopp knows better what the team needs and which strategy is suitable to implement, but he also does not rule out the possibility that every player can change so quickly to find his best performance. Let's see how Nunez is capable of in the next game, Is it true that he hasn't found his sharpness as a striker or is he currently back to being one of the sharpest strikers in the English league.
After the game against Newcastle and Nunez scored a sensational goal and performance now a lot of people are saying and in the opinion that Nunez should have been brought on earlier and should be in the first place, I think football is not like that and there are some players who deserve to be saved and there are several players who deserve to be played from the start to carry out the performance / tactics of the coach who can make the team perform as the coach wants.
Nunez did not appear at his best in his first season with Liverpool and it's normal that many people doubt his abilities at this time. Nunez's mentality actually looks better than some other players and he proved that when he managed to score two goals in a crucial game against Newcastle. So based on these considerations, Nunez should have regained his place as a starter in the first team, Nunez doesn't need to be saved because his performance isn't too bad, it's just that his scoring instincts need to be improved.