What Biden said was not to calm anybody. In the absence of a request by the Iraqi government, the US schedule to leave if set in stone. There is a written agreement signed by a US President, Bush, to that effect. Unlike the Netanyahu government, the US government adheres to prior agreements.
U.S. to deliver 8 advanced F-16s to Egypt on July 30-31, U.S. embassy in Cairo says (Reuters)
from the article: When it comes to Iraq, Iran loves a power vacuum