That would have been AutoPilot 6 years ago.
AP back then had radar, but radar cant reliably detect a stationary object at high speeds. Every OEMs traffic aware cruise control had this weakness if its radar based back then. They typically warn you about it before first use, which is part of why you must pay attention.
Only vision or lidar can address an issue like this, and cars weren't really shipping with lidar back then.
Newer Teslas with HW4 and FSD would handle this better. HW3 and FSD might not reliably handle it, but its hard to say.
Edit: and even today on HW4 car, AP would probably fail here like this story. Its just not meant for this and is very very old at this point.