"I was weak and couldn't go outside much, so, I naturally earned how to personally dismantle large wild game corpses while living in modern Tokyo"
...
Look. I'm okay with flimsy excuses. But this... just emphasises how inexplicable it is for him to know this. It's like the logic of an alien, or a four-year-old, or something an AI would come up with, fitting the right form of a correct explanation but flagrantly defying any rational logic...!