Is “He held two-thirds of the realm but still served the Shang” true?

attested in history

The Analects, 'Taibo', praises him for 'holding two-thirds of the realm but still serving the Shang.' Official history records that he was benevolent, respected the elderly, and treated worthy men with courtesy, leading many诸侯 to submit to the Zhou tribe.

King Wen of Zhou

In official histories, he is the virtuous leader of the western诸侯 at the end of the Shang dynasty, while in novels he is endowed with the ability to devise brilliant plans and predict the course of fate.

Other claims about King Wen of Zhou