I must admit that I don't understand why humanity is always been obsessed with the idea of its creations turning against it, especially artificial intelligence . Although his solution is obviously insufficient, more specific and binding rules are immediately apparent. Go back to your little conversations. The second point being that the ideas you expound are garbage. You can't always just study an intelligence in a laboratory and expect it to stay put.
Intelligence can find solutions where there are none.
Psychologists once locked an ape in a room, for which they had arranged only four ways of escaping. Then they spied on him to see which of the four he would find. The ape escaped a fifth way. You can't rely on an intelligent being to stay where you put it. As for limiting the intelligence of AIs, you would only be able to do that if you researched how to block them from gaining a greater amount of intelligence than you want them to have before you created any AIs.