In the linked tables, FOV refers to horizontal field of view, according to the key. The discrepancy would be due to the fact that the values calculated by exiftool refer to diagonal angle of view.

As pointed out in comments, "field of view" would technically be defined as a distance across a plane at a given distance from the sensor. In practice, "field of view" is commonly used to mean "angle of view", as in both of your sources. Angle of view is generally given as diagonal, unless stated otherwise, since this is the angle needed for a lenses image circle to cover the entire sensor. Therefore, when asked for "angular field of view", this is probably what's being asked for, but if it's important you should confirm this.

Note that the values given by exiftool are based on the reported sensor dimensions and lens focal length, and may or may not be accurate enough for any given purpose. The documentation you linked to seems to imply that the use of OIS can slightly alter the actual FoV, for instance. For any critical purpose you could do some empirical testing, either by measuring a physical scene, or using software such as Hugin to stitch a 360-degree panorama (it will calculate this information about the provided images in the process).