Are you serious? Jeter was arguably the best player in baseball in exactly 1999, and there's really no other time there's a strong argument for him in the top 5. I don't think one year really puts you in the argument for best player in the world, so realistically, I don't think he was ever truly in that discussion. Particularly given that, in his prime, A-Rod was also playing SS and doing it better. Realistically speaking, Jeter was the best player on a balanced team. The original golden age of the Yankees, from the '20s through the '60s, was littered with superstars. For most of those 5 decades, one of Ruth, Gehrig, Mantle, or DiMaggio was arguably the best player in the game. Some of the Mantle/DiMaggio teams had weaknesses, and even the Murderer's Row team of the late '20s had less than ideal pitching, but the big stars were huge. The second golden age of the Yankees, in the '90s and early '00s, was all about balance. The only time they had a guy who was seriously in the argument for best player on the planet was when they first signed A-Rod, and everybody hates him now so he's clearly not going to compete in fan-polling based lists of this nature. Jeter just wasn't the best player, or as I said, seriously in the argument for top 5. He was just the best player on a very good, very well-balanced team.
DiMaggio was probably the 2nd-best player in baseball for most of his career. At least the 2nd-best position player. Some of the career numbers, in the counting stats, can be underwhelming, but that's what happens when you give up 3 years in the very heart of your prime to go to war. Speaking of WAR, I think we both agree it's imperfect, but IIRC DiMaggio is actually ahead of Jeter in career WAR in spite of playing only a little over half as much. I don't know if I buy that DiMaggio had the more valuable career, but he was clearly the better player, and I think that's more what this list is driving at.
IIRC, DiMaggio's career OPS+ is about 40 points better than Jeter's. That's absolutely astronomical.