I'm a bit confused about iOS 64bits

I'm a bit confused about iOS 64bits

it seems that iOS 64bits application should run on 32bits as well as 64bits phones, because the application provide both binaries...and 64bits version is now mandatory for Apple Store
https://developer.apple.com/news/?id=04082015a

so why is there two target for iOS ? And why can't I run the 64bits version on a 32bits iPhone 4 ?!

And why does the iOS options crash the French IDE !!!
https://quality.embarcadero.com/browse/RSP-12975
https://developer.apple.com/news/?id=04082015a

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