Jupiter as a planet does not easily lose mass. What can happen, is volume contraxion - which to our boy Batygin looks like happened. This paper came last week but it keeps bubbling into sites and Youtubes I visit so, let's get it over with...
This size is "measured" from Jupiter's oft-overlooked "fifth moon" Amáltheia, a jagged rock orbiting closer to the royal planet than Io. Also, then, Jupiter had fifty times the magnetic field. I don't know how they measure Jupiter's radius retroactively, nor honestly its insolation (yo, Grand Tack). Jupiter's composition won't be subject to nuclear alchemy, but some chemistry should have happened since then. At least the Amalthean magnetism can be measured, given all the probes we've sent to Planet Five.
I wonder if this lore has been bootstrapped to/from extrasolar large-but-fluffly newlymade transiting planets.
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