Chuck appears to be very confused (and not just about this event, he struggled through the entire video). The Iran-backed Hashd al Shaabi militia we are attacking are going into Syria to SUPPORT Assad, not oppose him. We are bombing them not because we support overthrowing Assad (we do), but because this same militia on occasion attacks US forces. Hashd al Shaabi, aka PMU, passing anywhere near our guys is a threat, and we don't want them establishing a presence in the area we have troops stationed.
So the U.S. is hitting Iranian proxies?