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These are partially wrong. Pupil size/shape has no effect on field of view. A better way to judge FOV is where the eyes are placed on the head. Both in front like humans: small-ish FOV. On the sides of the head like a rabbit: larger FOV.
It's also wrong about a lot of the reasons. For example vertical slits are probably to increase depth of field, providing something that might be easiest to understand by considering if the animal had two pairs of eyes, one stacked above the other.
Yeah I don't get why it's attributing so much to the pupil when lense, eye shape, placement and size are likely bigger contributors to everything mentioned like field if view and "seeing the ground".