You are right, reversing polarity on a wifi or BT antenna will cause no harm, but those are not antenna wires. The gauge of the wires is too large for antenna wire and antenna wires are shielded. And you don't normally see clip-on connectors for antennas, and would not for a permanently fixed antenna integrated in a notebook. The antenna cable would be soldered for maximum continuity, strength, lighter weight, and lower cost, or use a more secure, shielded semi-permanent screw-on connector.
Clip-on connectors similar to those seen in that image are often used on batteries that must be replaced every so often.