Agreed. This isn't shocking news to me - it's what JR has been saying all along. I never expected him to sell the team this year.....and even if he was, I never expected him to even hint that he was.
To the latter part of your sentence, the only logical answer to me is that Ishbia must have secured a right of first refusal agreement from Reinsdorf when he dropped his Twins bid. Jerry is 89 and Isbhia is 47. He could very well have decided it's worth waiting a few years for the opportunity to own a MLB team in his hometown and in the 3rd largest market.
But what if Jerry lives to be 102 like Virginia McCaskey! What if, what if.....not very likely even if Jerry is in relatively good health now. And note that he said he's not interested in selling as long as he's in good health, not until he's dead. Sadly, a lot of people experience a sharp (and often sudden) decline in health when they reach the 9 decade mark of life.