The arguement is 135 kts Flaps 30 gliding performance better than 118 kts Flaps 25?
None of these two options happened. The flight ended at 102 kts flaps 25 (with headwind...) which is quite far from flaps 25 best glide speed corrected for the wind (probably more than 35 knots of difference). Since there was no time to accelerate to best glide speed, maintaining the speed at the moment flaps 25 were selected (118 kts) would still make a significant difference, especially on that side of the curve.