Once Timmy JR became a planetary nebula which was another collapsion when fusion and its fuel is spent. It ejects layers of matter out which is what creates the planetary nebula. Timmy JR and any other star going through this process because the star is dead and no longer working basically. Timmy JR is now a planetary nebula and after that becomes a white dwarf which happens from the star leaving behind an inner core from shedding the outer layers. And a black dwarf happens from the white dwarf exhausting its own supply of carbon, oxygen, slowly burning out which then transforms into the black dwarf. So Timmy JR and what is left of him is just remnants of the star, and he is in the death stage, just like Timmy on earth was millions of years ago. Some people believe in ghosts which could be what happened to Timmy after he died, like the remnants left over from him became a ghost just like the remnants left of Timmy JR became something.
White Dwarf
Black Dwarf
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It is important that we study the life cycle of stars become for one it is very closely related to our life cycle besides the amount of time it takes for the human life cycle and star life cycle. It also helps understand our solar system, to understand what is out there, and studying it could allow to learning more about the world, and why it formed. Timmy and Timmy JR both lived lives where their main sequence was the longest sequence where they had a purpose to fufill. May they RIP.
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The collapsion that occurs from the super red giant is what creates the supernova. The remnants and material left is what creates black holes or a neutron star. Timmy JR could become either depending on the remnants left behind after the explosion. And since super red giants aren't as common, you shouldn't need to worry about a black hole.
Super Red Giant
Since a super red giant is different from a regular red giant, they become what is known as a supernova after the super red giant phase instead of becoming a planetary nebula. The red giant phase is when the star's supply of hydrogen has been exhausted and now helium is being fused. If Timmy JR was a super red giant he would have spent more time in the main sequence as more large, massive stars spend longer in the main sequence. Also he would become a supernova one he exhausts his helium and fusion until his iron core builds up, which then creates a collapsion that turns into the supernova.