He’s not wrong, exactly. The second amendment doesn’t say “keep and bear some kinds of arms”, it just says “keep and bear arms”.
It’s kind of vague though. If a kid asks, “Can I have ice cream,” and their parents say, “Yes, you can have ice cream,” it doesn’t mean the kid can have whatever ice cream them want and in whatever quantities they want.
As a non-American, I always find it funny how some people revere the framers as having future vision and somehow infallible.
Actually, according to Wikipedia, “The first bolt-action rifle was produced in 1824” so that’s decades after the second amendment was ratified.