Algol
I think there is a confusion between the design process of circle to land and actual execution. The 25kt tailwind caveat earmarks the limit of the airspace that is available for circling from the point of terrain clearance. But when executing the circling within that airspace you still need to position the aircraft at a certain distance across on downwind and to a certain distance at the end of downwind for the base turn and that will not be same if you do not correct for wind. Without wind adjustment when turning downwind if you face strong HW you will end up very close to the RW and when turning base it will become tail wind and may blow you over when using the maximum permitted bank angle. Similarly the position at the end of downwind is determined by the prevailing visibility. The 25kt. tailwind design procedure may give you terrain clearance but runway may not remain in sight. So you need to adjust for wind but even that is subject to runway remaining visible throughout. There was a brilliant article on the subject by Capt. Eddie Foo in 2005 but I am unable to access it. It is also power point but that is not free.