He/she did not refer specifically to grass.
But he/she did say the following:
Still it seems that the aircraft needs more runway for the first part (before V1)
That statement is true only when operating from grass. So if you had taken the time to read and think about the question, you might have spotted that fact.
But that would have required attention to detail and a little bit of patience...qualities which do not appear to be your strong points.