Liverpool has't stopped yet. They're trying to hunt more talent to be recruited. They have done with Frimpong, Wirtz (medical check up), Kerkez, (still in the negotiation), and add Isaak as their last target. Their target to sign Isaak from Newcastle is just getting even more possible with Nunez who is still in the process to go to the Napoli(i expect him to play for that italian club).
I think we will see Isaak to wear Liverpool's jersey as he has open the move to the any big club that play in UCL.
After last season Slot did not provide any additions to his players it looks like this season he wants to burn more money than expected because we know Liverpool currently has brought in several players including for their most expensive player where Wirtz is almost 99 percent owned by Liverpool but indeed they still need a striker to make regeneration in their squad.
Signing Isaak is not bad, it's just that of course with this they must realize that Isak is not an easy player to bring in especially for the current release clause. On the other hand if their focus will be on Isak now then there must be some balance to release some of their attacking players and at this time although there have been many rumors about Salah or Darwin Nunez and Diaz there is still no clarity on this matter then Liverpool must provide clarity first I think so that in the end their focus is not divided again.