TOGA!
The Asiana plane was a 777-200ER which has a different wing and different flap limit speeds. 30 flap at 180 knots was not an option to the Asiana 214 crew.
Your post has the flap speed limits for the heavier and longer winged -300ER/200LR
"Lifted from 777 FCOM:
[-200LR, 777F, -300ER, -300ER/ULR]
1 Flap Limit Placard
Flaps extended speed limits.
Normal Flap Position Indication"