You apparently have no idea what you posted.
What you posted was a joint declaration between the now defunct government of Afghanistan and the Trump Administration.
You failed to comprehend this was not the agreement with the Taliban. From the joint declaration:
"The Islamic Republic of Afghanistan welcomes the Reduction in Violence period and takes note of the
U.S.-Taliban agreement, an important step toward ending the war. The U.S-Taliban agreement paves the
way for intra-Afghan negotiations on a political settlement and a permanent and comprehensive ceasefire."
In other words, there is a US-Taliban agreement that the now defunct Afghan government and the US agreed to abide by.
Here is what you should have attached: