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The numbers are kind of all over the place, and the verbiage in quotes from the PhD herself are oddly imprecise. For instance, she doubles down on the incorrect use of "superconductor."
Then, there is the amount of mass that the Starlink sats could leave behind:
The link in that passage says that the newer, bigger Starlink satellites are only 800 kg in total mass. I'm not entirely sure how an 800kg object leaves 1300+ kg of "charged dust" upon re-entry. Maybe there's compounding factors due to the prorated amount of rocket parts also burning up or something, but this whole thing seems... off. This is not to say that space junk is not a major issue or that a Musk-owned company would voluntarily do the responsible thing, but I say we put a pin in this for now and see what happens with her paper and any related research.
"Though 100 Kelvin is still pretty chilly -- that's about -280 degrees Fahrenheit -- this is an enormous increase compared to bulk aluminum metal, which turns superconductive only near 1 Kelvin (-457 degrees Fahrenheit)" source
It doesn't get that cold in LEO or GEO, so I'm not sure why the author of the paper is bringing that up. This paper and its author are looking more suspect by the minute.
I'm pretty sure that the environment inside the satellite gets nowhere near that cold. There are a lot of things like propellants and batteries which won't work if it gets cold. They usually have an active thermal control system to regulate temperature.