The article mentions as a drawback of non-radar-based cruise control:

"They also can't follow other vehicles quite as closely, with the following distance kicked back from one car length to two, meaning that it is easier for other vehicles to sneak ahead of them in traffic."

I'm not sure exactly how to interpret this, but at highway speeds, like from 55-85 mph, Honda's adaptive cruise control allows the following distance to be set from roughly 100 to 300 feet.

An "average" car length seems to be about 15 feet, so that converts to 7-20 car lengths.

If Teslas really do allow following other cars at 1-2 car lengths at, say, 75 mph, that's a bit startling. I can't say I've seen one doing it though.