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Flick said that he would do without new transfers, so this is another reason why Barcelona will not get Williams now. But of course, everyone understands that the main reason is that Barcelona has financial difficulties, and until they correct the situation, it will be difficult to think about such significant transfers. But I remember that Xavi said that Barcelona needed to strengthen the attack, and I agree with this, often this was a problem, so Xavi wanted to strengthen the attack in the off-season.
Based on several newspapers I read, one of which is 90min and Goal, the seriousness is clear when Barcelona is ready to spend funds to activate the release clause. On the same page, it is said that Deco, who is also the sports director, has also met with the Bilbao player's agent. Even though there has been no official offer or negotiation, Barca also seems to have been given the green light to make it happen. The reason is, Williams is claimed to have an interest in continuing his career with a much bigger club.
But at the same time, Barcelona is still having difficulty with the financial problems they are currently facing. To bring Nico Williams to Camp Nou, it is rumored that Barcelona will have to release the player and several names have been linked in this transfer window. as you said, Barcelona must strengthen their attack line. The presence of Nico Williams could be an ideal option in this summer window, at the same time he could be partnered with Lamine Yamal, who has both performed well on the international stage for his country, Spain. However, so far there has been no definite news regarding Barcelona's plans to bring Nico Williams to Catalonia.