As a True God, the life origin is the 'Divine Heart'.
Upon reaching the True God Realm, even if parts like the head, heart, arms, etc., are destroyed, it is not a problem. Divine Power can quickly recover them... Even if the entire body is completely annihilated, as long as the Divine Heart remains, it can all be swiftly restored.
It's practically an Undying Body!
Only the Divine Heart, if it shatters, will cause the Divine Heart World to collapse, and that is genuine demise.
"The Divine Body I have refined is comparable to that of the Divine Monarchs, but the sturdiness of my Divine Heart is far inferior to their 'Divine Rank'." Li Yuan was very clear on this point.
The Transformation of the Divine Heart into Divine Rank.
Essentially, it is the might conferred by the world once one fully masters a Law of the Great Dao, making it incomparably solid... This is what allows, within the Heavenly God Divine Rank, the metamorphosis into 'Inner Heaven and Earth'.