It is permissible to read their translation since the translation is simply a linguistic translation of the verses and usually not Tafsir of the verses. However, when you read the translation, do keep in mind that this is simply their understanding of Qur’anic words, and not the actual meaning of the Qur’an. One must read the Tafsir of Ahlulbayt (a) to have a more accurate understanding of the Qur’an.