Does the renewal of the jellyfish's youth and its not dying except by external factors contradict the noble verse, "Every soul shall taste death"?

What you have mentioned—if true—does not contradict the Almighty's saying: "Every soul shall taste death." The destiny of this creature, like all other creatures, is extinction and death. Allah is the Ever-Living who does not die, and all creatures will die, which is a consolation for all people.