That’s probably a fair claim. Tamil nationalism rather than Hindu fanaticism.
Just as most of the early Palestinian groups were nationalist rather than Muslim in orientation, with many having numerous Christian members and even leaders.
in my humble opinion, the PLO still is to some extent nationalist rather than Moslem in orientation. Of course, terrorism is terrorism. The 1930 to 1949 Jewish groups fighting the British in the Palestine Mandate were democratic to some who would be labelled terrorists. In the Tamil LTTE case their cause was never spouted as religious but Dravida.