Zydenbos is a strong opponent to some writers, like Koenraad Elst or N. S. Rajaram, who reject the scholarly consensus that the ultimate historical origin of the Indo-Aryan languages is outside India. Zydenbos characterizes such views, which are fringe positions outside India, as driven by the far-right political agenda of Hindutva ideology.
Zydenbos has written the first comprehensive Western history of Kannada literature and translated Kannada literature into both German and English. He also translated Dvaita, Virasaiva, and Jain writings from Sanskrit.
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