THE Angel of the Lord is the pre-incarnate Christ. The OT contexts that use this title identify THE Angel/messenger as Jehovah Himself. This is not to be confused with an angel, a created being. The Angel of the Lord is a title of Deity, not creature. Michael is creature. Deity as used theologically/historically refers to being God, not a subordinate god. The WT view and talk of Christ being Deity/divine would be polytheism, belief in more than one true God by nature (Gal. 4:8; I Cor. 8:4-6). Either Jesus is true God or false god. So-called gods are not Deity. Jesus claimed to be equal with the Father, not just a New Age divine being.
The eternal, invisible, triune God did not die (hence the argument that who ran the universe if God died is stupid; the Father and Holy Spirit did not incarnate and die, only the Son. The argument might have merit against modalism, not trinitarianism, though they say Father refers to Deity and Son of God refers to humanity, a wrong view totally). Jesus is the God-Man, one person with two natures. He can die because Deity added humanity. The God-Man died as to humanity, but not as to deity. God cannot die, but the One who died is God. Jude 9 does refer to a historical event, but it still distinguishes Michael/Jesus. Even on earth before resurrection, Jesus had authority/power, though limited and dependent as a human. As well, WT death as cessation is unbiblical. Death is separation, so the spirit left Jesus and remained conscious while the body was in the grave. Jesus died physically, but His spirit-soul continued on (soul sleep is heresy).