But you should dispute the bones, because all you have are qualia that you assume are caused by external states. Once you're allowed to make ontological statements like "the bones are real", the whole argument falls apart.

So to illustrate the potential flaw with causal thinking, sure. To illustrate the actual consequence, this doesn't work.

It's also worth pointing out that it's not just science that's hit by noticing that it is not logically impossible for some other thing to be the case. Every statement is in doubt. That you have an arm, that the earth is solid, that fire is hot, that the Internet is a thing--all that stuff is in doubt to the same degree.