Nico Williams on Barcelona can inflate his numbers by a lot with ease, i dont have any doubt about that.
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With the support of a better squad and manager tactics, Nico William productivity will definitely increase. I think Hansi Flick will make Nico William a key player in the main squad, Barcelona will not recruit him to be a second string player. Barcelona front line combination next season will look very sharp if Nico William is added, I think Barcelona has a striker who is no less great than Real Madrid.
Of course Barcelona recruited Nico Williams not to make him a bench warmer, he will get a place in the main squad because of his background as a regular player in the Spanish national team and Bilbao. Hansi Flick will have to change his formation if Nico is brought in because he plays in the same position as Raphinha. I predict Barcelona ideal formation (if Nico officially joins) is 4-2-3-1, the midfield is filled by De Jong and Pedri, while Yamal, Raphinha and Nico will help Lewandowski as a lone striker. Of course this formation is very scary, Yamal and Nico abilities make the wing area very dangerous, while Raphinha becomes a shadow striker who is free to operate in any area. This kind of player material is then supported by Hansi Flick's attacking philosophy which will make Barcelona attacking power very difficult to stop.