So I guess we've just decided to let supposed originalists weigh in on the constitutionality of an out-of-office impeachment without paying any attention at all to what the term "impeachment" meant in the 1780s? Classic.
There was a high-profile out-of-office impeachment—which the framers knew about—happening in Britain at exactly the same time the constitutional convention was designing an impeachment process for the United States.
The only reason the framers had to limit the punishments that could come out of an American "impeachment" trial is that they knew readers would construe the term in light of British practice.
But no, people are opining in public as if "impeachment" were a word the American constitutional framers made up for a completely new practice.
By late summer in 1787, the British parliament's impeachment of Warren Hastings—begun after he left office—was probably *the* thing that politically engaged people in Philadelphia would have immediately thought of when they heard the word "impeachment."
Anyway. For insight into the constitutional convention's deliberations over the impeachment power, read @ErickTrickey's article from 2017: https://www.smithsonianmag.com/history/inside-founding-fathers-debate-over-what-constituted-impeachable-offense-180965083/