Maybe, and maybe that means that the Japanese internment was worse then anything the federal government did to the Native Americans.
I mean, it's not like native Americans were forcibly relocated from their homes into federally designated lands for a handful of years like the Japanese... oh, wait...
It didn't happen then, but that doesn't mean it can't happen now. For several decades, the Republicans have played political hardball to pack the courts in their own way [1]; I doubt that was a factor nearly a century ago.
[1] bitter obstructionism to maintain vacancies until they have the power to fill them with their own picks, selected primarily for ideological reliability.
the feds vs states thing seems like a distinction without meaning, tbh, the federal government certainly intended the states to deal with natives as they did, and there is absolutely no shortage of crimes done by the federal government itself (treaties broken, allies backstabbed, lands taken, literal genocide, fucking DAPL)
Eh, if the definition of "court packing" is so narrow that it only covers things nearly exactly like FDR's proposal, then I don't consider it a very useful term.
If it makes you more comfortable, feel free to replace "court packing" in my comment with a term that's general enough to encompass FDR's proposal and the Republicans' recent tactics.
Instead the federal government can do anything it wants. It's why we have the drug war, DEA, huge national debt, broken medical system.