-He will need to pay for the apple developers program $99.
-Download and install XCode.
-After that, you will be able to create signature keys and connect in applestore connect.
This will allow you to post packages collected on your Apple device.
I was considering this recently and had to buy a macbook and an iPhone. There were other options with renting a virtual device, but they are all unreliable it could cause me to lose my game.
-If your product finds its audience on android you will make money and can invest in buying new devices like I did.
-If your game won't be played on android, don't kid yourself, it won't be played on apple either.
I recommend not to rush with applestore and put out there only after the profit on android.