I understood it to mean the whale is women's rights, and the Japanese are trans people.
So people say "protect women's rights" and everyone can agree this is a progressive, lovely, fluffy thing to do and no one in their right mind would disagree with it (similar to "save the whales"), but then what GC women mean by that is "protect women's rights by killing trans people".
Which is as ridiculous as it is patently false.
But even so, with its insane level of hyperbole and paranoia, it's still a little bit telling. The Japanese do hunt whales (they pulled out of the international whaling commission in order to resume commercial whaling in 2019). Japanese commercial interests are a definite, identifiable, demonstrable risk to whales and thus, by equating trans people and their rights with the Japanese in this metaphor, India is inadvertently admitting that yes trans rights are a identifiable, demonstrable risk to women's rights.