This is why we need better rules for feedback. I personally feel this would be a fine neutral feedback, since there's no way to prove what's being said, but there definitely should be a record of it somewhere.
I would also like to know how quickly the acct was banned etc. If it was a month vs the next day, my opinion could change.
I wish people would put their opinions why they are voting one way or another, as discussion can often help other people understand a specific point of view.
Also, im 100% less likely to vote to remove feedback after noticing the OP left what seems to be retaliatory negative feedback on the accusers account also. I haven't voted no yet. Only becauss there's still time for information to come to light or people to delete their feedback. But that's def the way I'm leaning.