The Quran is written in plain Arabic, the words and sentences are easily understood, the difficulty lays in finding the context in order to get the best understanding possible, and the context and explanations are usually found in books of tafsir, or by speaking to a scholar
Navigating the Quran's original Arabic can be challenging for non-speakers, and while translations offer valuable insight, they may not fully encapsulate its essence. Despite these hurdles, there are meaningful avenues for non-Arabic speakers to connect deeply with the Quran's teachings through resources like Quran Learning for Non-Arabic
Most Arabic speakers who are Muslims will know Quranic Arabic as teaching the Quran is often a part of a child's education. Generally, most Arabic speakers will know both Quranic and Modern Standard Arabic.
As stated above, their excuse is that the Qur'an is not in their language and only an Arab or an Arabic speaker can understand the verses. The truth is however far from their mistaken beliefs. A believer can understand the Qur'an and live by it even while possessing little or no Arabic knowledge.
I'm telling you as an experienced Quranic Arabic teacher, having now taught hundreds of non-Arabs, that learning Arabic, understanding the Quran and being able to speak Arabic is easy. Allah, the Glorious, the Majestic tells all of us that He is the One who has made this Quran easy for all.
Yes, you need to learn Arabic to understand Quran. Quran has hundreds of translations that may assist people who don't speak Arabic to understand what's written in it. However, these translations are not enough to capture the beauty of the Quran and its accurate meanings. Allah SWT said:
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do arabic speakers understand quran