“The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behavior” U.S. Const. art III
Your statements dismiss as surplusage the conditions which qualify tenure.
> Less than 10 judges have been removed
So what? It does not change the rule, the rule which you dismiss.
Where did I dismiss the “rule?” The fact that any federal official can be removed from office by impeachment is understood.
But if it makes you happy, I’ll reiterate: Article III federal judges have lifetime tenure as long as they exhibit good behavior. Federal judges can also resign or retire.
For example, Joseph William Woodrow was appointed a federal judge of the Nebraska District Court by Woodrow Wilson and served from 1916 to 1933. He was then appointed to the U.S. Circuit Court of Appeals by Franklin Roosevelt and served from 1933 to 1961. He then became a Senior Judge and finally retired in 1977. That’s a total of 61.5 years as a federal judge. Seems like a lifetime.