[sudosysgen]

I really am not. If you don't believe me, calculate the depth of field on this website: https://www.pointsinfocus.com/tools/depth-of-field-and-equiv...

Set sensor size to "custom (NaNx)". Set Custom Sensor to "1". Set focal length to "25mm". Set aperture to "f/2". Set distance to 2m You will find a DoF of 759mm.

Then set Custom Sensor to "0.5". Set focal length to "50mm". Set aperture to "f/4". You will find a DoF of 748mm due to rounding errors in the calculator.

Then if you set custom sensor to 2, focal length to 12.5, and aperture to f/1, you'll find a DoF of 739, again not quite equal due to rounding errors.

As you see, if you double the sensor size, double the focal length, and use an equivalent aperture, you have the same DoF.