Again I have already provided evidence to counter that assessment.
This does not show an attempt to renegotiate the SOFA.
Not only did you miss it at the time in 2011 but in the article I linked to as well.
"Over the last year, in late-night meetings at the fortified compound of the Iraqi president,
Jalal Talabani, and in videoconferences between Baghdad and Washington, American and Iraqi negotiators had struggled to reach an agreement. All the while, both Mr. Obama and the Iraqi prime minister,
Nuri Kamal al-Maliki, gave the world a wink and nod, always saying that Iraq was ready to stand on its own but never fully closing the door on the possibility of American troops’ staying on.
Through the summer, American officials continued to assume that the agreement would be amended, and Mr. Obama was willing to support a continued military presence. In June, diplomats and Iraqi officials said that Mr. Obama had told Mr. Maliki that he was prepared to leave up to 10,000 soldiers to continue training and equipping the Iraqi security forces.
Mr. Maliki agreed, but said he needed time to line up political allies.
Mr. Maliki was afraid that if he came out publicly in favor of keeping troops without gaining the support of other parties in Parliament, his rivals — particularly the former Prime Minister Ayad Allawi — would exploit the issue to weaken his shaky coalition government. Eventually, he got authorization from the group to begin talks with the Americans on keeping troops in Iraq."
U.S. and Iraq Had Not Expected Troops Would Have to Leave