That article is weirdly worded. The Mercedes pilot is specifically meant only for traffic jams (so you can do something else while the lane crawls along). Hence all the limitations. It’s not cruise control. They have different tech for that, and it’s not level 3. The level 3 traffic jam pilot might eventually grow into level 3 cruise control but for now they’re distinct and Mercedes has not tried to pass one as the other afaik.