"The judges, both of the supreme and inferior courts, shall hold their offices during good behaviour, and shall, at stated times, receive for their services, a compensation, which shall not be diminished during their continuance in office."
No life term in there!
"Article I tribunals consist of certain federal courts and other forms of adjudicative bodies. These tribunals, as created by Congress, are of various forms, and have differing levels of independence from the executive and legislative branches. They can be Article I Courts (also called legislative courts) set up by Congress to review agency decisions, ancillary courts with judges appointed by Article III appeals court judges, or administrative agencies. Article I judges are not subject to the Article III protections.
For example, these judges do not enjoy life tenure, and their salaries may be reduced by Congress. The existence of Article I tribunals has been controversial, and their power has been challenged before the United States Supreme Court, which has determined that Article I tribunals may exist, but that their power must be circumscribed and, when a potential deprivation of life, liberty, property, or property interest is involved, their decisions are subject to ultimate review in an Article III court."
Courtesy of wikipedia!
Happy to help.