Earlier quoted context omitted.
He/she was not fired for fucking up the trump's account. It was his/her last day in twitter.
This is the sort of thing that can change that. Any holiday pay or extras that may have been owed to this employee might disappear, they could also have been fired immediately if twitter wanted to send a message and acted fast enough.
[1] https://twitter.com/CaseyNewton/status/926278000152154112
[2] https://twitter.com/winterjessica/status/926270231605055488