WiFi is a specific protocol, IEEE 802.11 (with a lower case letter at the end for the version). There have long been hobbyist and commercial methods for using it with point-to-point links. There are some other wireless methods for this, like LoRa/Meshtastc, but they tend to be slower and less developed. Everyone prefers using WiFi.

So, yes, they are using WiFi in a point-to-point way. The antenna is directional to give it (potentially) several miles of range.