> I thought it was precedentual within its circuit until an appellate says otherwise?

No, trial court decisions are never binding precedent, if they are “published” decisions, they may generally be cited as persuasive precedent. Appellate decisions (Circuit Courts in the federal system) are binding on the trial courts subordinate to that appellate court (and even on panels of the same appellate court) until reversed by the same court sitting en banc or by a higher court (the US Supreme Court in the federal system.)