Not a strawman. It is the exact claim you made previously. Now you are saying that in order to understand the Quran correctly I have to "know check various meanings of words and disputes among Muslims about them." Based on your earlier claims I should be able to pick up the Quran in Hebrew, ignore all Islamic authories, and go by non-Muslim scholarship. I have done that before and here I am.
If I don't need to know Arabic then Arabic scholars don't need to know it either. We can all just rely on the English translations made by anyone w/o going by authentic Quranic scholars, who obviously learned Arabic to be considered authorities.
I didn't say I understand all of the Torah or Tanakh. I'm saying I understand a main theme of it which can't be hidden in any translation because of it's repeated nature and all translations show it.