If the game is actually doing a 1.35x magnification as it says, based off your hipfire fov, then it should be ~95.36° 16:9. (360 * arctan(1/1.35 * tan(112 * pi/360)))/pi =~ 95.36
Since the sens scaling is known (it is a monitor distance match system after all), you can measure the revolution distance and see what hipfire-fov conversion has that distance.
You could also resize the image to preserve the scale, and then use the above formula to calculate the fov. In this case, it looks like the first example is actually a ~1.19x increase in scale when ads, so first example is (360 * arctan(1/1.19 * tan(112 * pi/360)))/pi =~ 102.5°.
Second example is like 1.64x increase in scale when ads, so (360 * arctan(1/1.64 * tan(112 * pi/360)))/pi =~ 84.2°.
edit: The calc actually already has the reflex sight as an option, and with 112 fov and affected ads fov, it says it is 84.19° actual hfov.