After what happened to Nunez previously, I think at the moment Liverpool is really very selective in buying players especially at high prices and that's why be the reason for their absence in last two transfer markets this season, Isak currently have a contract until 2028 and I see that it be to their advantage to can keep Isak from any team which is interested in him, so in this case we cannot equate Isak with Osimhen, because after all the situation of the two players is much different, Osimhen at that time openly wanted to move to a big team, while Isak only expressed interest in wanting to play with Liverpool someday and so far it is only an interest and not a strong desire for he leave.
Yep, even though Isak is really impressive in this season, but his first season with Newcastle wasn't impressive. His performance in Real Sociedad wasn't really good, he only looks potential, but he wasn't the beat player at that time.
So, it's risky to sign Isak, if Liverpool sign Isak, they might repeat what they did with Nunez.
Nunez also was good for one season.
What you say is true, this season he has made a fairly big contribution to Newcastle even though he is seen as a sharp striker at Newcastle, but we cannot deny that not all strikers can show the same performance when he moves to other teams, compared to Newcastle of course Liverpool have a champion mentality in their DNA and that will put more pressure on Isak later in competing for the main place, as I said above, Isak may suffer the same fate as Nunez who performed very well at his previous club but actually lost the competition when he was at Liverpool, although Isak looks very potential to be Salah replacement but it is indeed better for Liverpool to find another striker who can really be consistent wherever he plays.