Islam critiqued tries talking hadith; The conversion of Thumama?

In answer to the video "No Compulsion in Religion"

The story of Thumama is actually an interesting one. When the prophet permitted the killing of Thumama b. Uthal, the chief of Banu Haneefa who had assassinated a number of the Prophet’s Companions, and had even plotted to kill the Prophet himself, yet when he was captured, not only was he given to drink from the prophet's own she-camel but after repeated invitation to Islam and repeated rejection, was eventually set free. He returned to the prophet's mosque and eventually converted, impressed like many others by the prophet and Islam's high morality. He knew he deserved the death penalty, as seen from his own answer

"If you do me a favour, you will do a favour to a grateful person. If you kill me, you will kill a person who has spilt blood. If you want wealth ask and you will get what you will demand"

yet the prophet neither was vengeful, nor wanted favors and much less money from him, despite his influential tribal position. Upon his arrival to Mecca and after an enthusiastic declaration of faith, in his zeal he implicitly answered a questioner that he had always been a Muslim

"When he reached Mecca, somebody said to him: Have you changed your religion? He said: No! I have rather embraced Islam with the Messenger of Allah".

The prophet had to temper Thumama's overzealousness later on; when he returned to his tribe and the most influential among the people of Yamama converted after hearing his story. Thumama convinced them to halt all grain supply to the Quraysh. Such a sanction would have been highly effective in draining the Quraysh, but the noble prophet interceded on behalf of those very ones that had starved him and his early companions in a ravine, persuading the people of Yamama to resume trading with Quraysh, preferring to take the harder but nobler route to victory than the faster one at any cost

"The Messenger of Allah (Sallalahu Alayhi Was-Sallam) did not have to choose between two matters, but that he chose the easier of them as long as it was not a wrong action. If it was a wrong action, he was the furthest of people from it".