I know, that’s one of the most ridiculous tacks these people take. If you need to understand Arabic in order to understand the Koran, than all of the conversions that have happened outside of the Middle East, to the millions of non-Arabic speakers throughout the globe, should be rendered moot.
Imams even use it when non-Arabic speaking Muslims ask question like the age of Aisha, drinking camel urine, dunking a fly in water, all water is pure etc. Is that one needs to read it in classical Arabic to really understand it. If that does not work it is simply a weak Hadith. This is why no Muslim apologist will debate people like David Wood who have extensive knowledge of Islam.