GP's comment reads reasonably clear to me: humans fearing orcas might eat them are about as rational as the cat visiting GP's garden, which also seems to be convinced GP wants to harm rather than feed it.
I think I didn't manage to see that meaning because the comment it was replying to had nothing to do with humans thinking orcas want to eat them, it was about orcas bringing food (like dead fish) to give to the humans. So more like a pet cat bringing a dead mouse to its owner than a cat in the garden fearing that the human wants to eat it?
ETA: swores mentions this in their pastebin
I’d probably be nervous if I was sailing on the Atlantic Iberian coast and saw orcas, they’ve been ramming and pushing rudders and fucking around with sailboats, no thanks.