Reading a paper: "Bahá’u’lláh and the Luminous Mind: Bahá’í Gloss on a Buddhist Puzzle"

[Ahanu]

Basically, he had no information beyond his region and religion (which was Islam). Hindus will term such a person as 'koopa manduka' (the frog of the well, knowing nothing of the world outside the well).

He directly responded to questions about Hinduism and Zoroastrianism.

The Tabernacle of Unity | Bahá’í Reference Library (bahai.org)

Among the first individuals outside the Islamic community to be attracted to its teachings, presaging the flow of people of all faiths and origins into its universal embrace, were Zoroastrians in Persia and India. To this group Bahá’u’lláh addressed a number of Tablets, several of which are presented here for the first time in full authorized translations.
(The Tabernacle of Unity)
www.bahai.org/r/398791792​