When one considers an infinitely and exponentially increasing intelligence that can quickly bypass the point of easily answering the questions that currently most perplex us in all fields, then it is reasonable to believe that intelligence would arrive at a level of considering (and solving) problems that we cannot even imagine, let alone understand.
Given that Elon Musk has spoken about has concern over AI, it would be interesting to hear how he integrates that with his belief that our intelligence is sufficient to understand anything.
No. To make that leap, I must assume the conclusion. I cannot know that I'll be able to observe what it does, because I don't know what it will do (or whether I can even perceive the dimension in which it does it for that matter).
Secondly, the word "understand" is subjective. I assume that Musk meant the word in the sense that there is sufficient depth of understanding as to actually be meaningful, else his statement itself would be meaningless (i.e. so obvious as not to be required).
All maths done till ~1600 AD could have been done in 50 years, if you see it from perspective of a civilization which has a stable existence. And forgetting all abstractions, stability of surrounding civilizations is basically a random phenomenon.
And I'm sure maths done in physics departments is beyond understanding of 80% people outside it, let alone any civilization which started 400 years before us.
1. Knowledge that is potentially within our understanding, as humans, even if it takes a few centuries.
2. Knowledge that would require a few millions of years, because we'd need to evolve beyond our current level of intelligence, similar to what chimps, as a species, would need to do if they were to really understand theoretical physics (that is, assuming chimps would in fact evolve to higher intelligence, if there were, say no humans around).
A reasonable interpretation of Elon Musk's claim would be mainly arguing against the existence of a barrier like the type 2 knowledge. But I could be entirely wrong, I haven't read his reasoning behind this claim.
Being a philosopher is not an extraordinary designation, such that it puts them beyond the mental abilities of someone of Elon's obvious mental aptitude.
Yet humans clearly fail to understand things like radioactivity (and the risks involved, for good or bad). I'm not sure what Musk thinks is reliable at all in this matter.