Psalm 100 is one of the forty-nine anonymous Psalms among 1, 2, 10, 33, 43, 66, 67, 71, 91-99, 102, 104-107, 111-121, 123, 125, 126, 128-130, 132,
134-137 and 146-150. The answer to your questin is True. I hope this is the answer that you were looking for.