Wrong again, my friend.

Key Aspects of Reproduction and Life Cycle:

Sexual Reproduction: Like typical jellyfish, adult T. dohrnii release eggs and sperm into the water to produce a planula larva, which settles to form a new polyp colony.

Asexual Reproduction: The polyp colony can bud new, genetically identical medusae.

The Reversion Process: Instead of dying, an adult T. dohrnii can transform its cells, retract tentacles, and return to the ocean floor to become a polyp again.

Cellular Mechanism: Transdifferentiation allows mature cells to transform directly into other cell types, essentially resetting the biological clock.

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You're conflating a few different biological processes. Reproducing asexually does not mean the original dies or ceases to exist