Math:
185.76 - 180.30 = ?
5.46 tonnes, which even with rounding up is less than 6 tonnes
But if we are being picky, we should include:
For all of these values, the influence of an increase in weight of one ton was examined and found to be negligible.
For a tailwind of 8 kt, the takeoff weight is reduced to 183,300 kilograms due to a tyre speed limitation.
statements which are not on the same page.
Also the actual tail wind at brake release was between 3 and 4 kts. But I grant you that the tailwind prediction may have led to the early rotation.