They will likely give the Kurds assistance similar to what we provided, that is artillery and air support, including some air defense. It seems the Kurds were forced by our pull out to actually engage Assad on diplomatic terms and make some sort of deal.
While Syria is no match for Turkey, the introduction of Syrian Government forces changes the legal and moral balance. We shall also see if Erdogan is willing to commit the forces and casualties required to overcome the combined Syrian/Kurdish forces.
Syria is no match for Turkey