From the comments section by A'amokat:
Below is what the Pechanga Constitution and Bylaws says about the recall of elected officials.
RECALL OF OFFICERS AND FILLING VACANCIES.
Section 1. Recall of Elected Officials, Elected Officials may be recalled.
(1) Recall Procedure shall be initiated by presentation of a petition at a general meeting. The petition shall be in the form described in Article X11 Section 2.
(2) A recall petition is automatically the first item of business to be considered at a duly noticed meeting.
(3) If at the duly noticed meeting, the majority finds that the reasons stated in the petition for recall are justified, then a recall hearing shall be held.
(4) A hearing and the vote on the recall will take place at the next duly noticed meeting.
So David Miranda has not been been given due process of law and has not been legally removed from office because none of the procedures specified in the Band's constitution have been followed.