Is it obligatory to inform a person that Allah's Light is not like the light of created beings after he states that Allah is neither a body nor light?

The term "body" (الجسم) has not been affirmed or denied in the Quran or Sunnah, and the rule prohibits its absolute use. If the one who uses it intends a correct meaning, we agree with the meaning, not the word itself. As for "Light" (النور), it is one of Allah's Names and Attributes that befits His majesty, not resembling creation. If the questioner has denied Allah being Light, then he must correct this error.