Words don’t mean anything to the current breed of Democrats: there’s not abiding reason for any of them to worry about defining terms or “being precise”. The “gesture” , the “symbolism” of the act of impeachment takes precedence over the legalistic meaning of the word.
The Ministry of Truth has great power. It is far easier to change words when they are on the Internet than it was back when Winston had to sit at a desk to change what was written in paper books in 1984