Is this a "deep" saying?

No ... it is not deep.

It is too esoteric to be deep.

To be deep you need to be able to easily and speedily get the gist of the meaning.

But for that one, even Aristotle would stumble.

i suppose so.

i went to the link you posted, read his explanation, and i still don't know what it means. (:

but i do get the gist somewhat, and it is over my head.

i suppose einstein would understand it, completely.