What other interpretation or meaning do you think this is apart from him leaving the club? He said he wants to explore, where hasn't he explored in the Newcastle that you think it's not an exit his talking about, or it's another position you think he wants to play for Newcastle?. It's very simple man, Isak wants out of Newcastle and right now Newcastle is looking out for his replacement and they have even contacted Sesko of Leipzig and the club is willing to sell him. Today both Newcastle management and Sesko are going to have a meeting to discuss personal terms.
I saw the news on Fabrizio's page a while ago, and no other thing could possibly come to my mind except him wanting a move at this point. I knew a day like this will come, and it came sooner than I expected. Arsenal has been on the Isak deal for sometime now, until several clubs started showing interest. I remembered Newcastle placing a price of £120M during the January transfer window, just to scare Arsenal away, and now Liverpool proved that the £120M was never a big deal, which I think motivated Isak for an exit.
As it stands, Newcastle are currently exploring the case of Sesko, which it think they will likely get for €100M, which is far less than £100M. I'm not sure if Liverpool still has what it takes to get Isak, after spending on their new forward recently. But if they have, then they should go for him.