The chance of that being setup by the actual Luigi Mangione is 0%.

Other than that, nothing about this says anything about why it was banned. If they were posting beheading videos with CEO faces plastered on top and details on where those CEOs live and go to work, it would be weird if they didn't get banned.

Not on Reddit, not on Lemmy, not on any social media that is at least halfway decent.

It's censorship. If I in theory set up a Lemmy instance to share CP, what could Lemmy do? maybe release a statement they don't like that content.