Vivotek Horizontal Field Of View Misrepresentation?

Vivotek has a camera, MD8562, which claims to have a horizontal field of view that is 110 degrees.

Given the specs on the camera, the sensor size is 1/2.7" with a fixed focal length of 2.8mm. Given Theia's lens calculator, they show 93 degrees. Other calculators and a formula I have for determining HFOV come up with appx. 87 degrees.

Why are these claims so obtuse? Is there something I am missing? Given everything I know about surveillance I find it hard to believe this camera actually has a 110 degree horizontal FOV.

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