Correct, it's all down to the maths.They list it as giving you an extra 15k Stariott points on your transfer so it's like redeeming 75k to get the 25k on most airlines, but it's not a straight extra 5k airline miles bonus.
Unless my eyes deceive me there's only 3 partners not using the 3:1 rates, JetBlue, United, and Air New Zealand. JetBlue is 6:1 so the math is a little cleaner, you should wind up with 12.5 when transferring the 60k for them. Air New Zealand must have a very interesting program to be 200:1.