The hadeeth is an indication of the great position of the husband.
The word: may Allah kill you is not intended literary. It is a word used in Arabic but the meaning is not intended like saying may Allah shave your head or slaughter your throat. This is not intended and the Prophet salla Allahu alaihi wa sallam used it in a number of occasions as in the Hajj when they told him that Safiyyah, may Allah be pleased with her has menstruated. He said A’akra Halka which means may Allah shave her head or slaughter her throat.