Proof that reflections are Negative (https://youtu.be/NGRTuFYt87s?t=412), by Distinti! <------- What does this reveal? ROFLMAO!!!
Gravock
It's not that simple. Reflections are not systematically "negative". This video only concerns the particular case of circularly polarized waves. The reflection reverses this polarization.
If the wave is linearly polarized, and perpendicular or orthogonal to the plane of the mirror, the polarization is preserved.
In other cases of linear polarization, it will depend on the angle and the kind of mirror. The polarization after reflection will be elliptical if the reflector is metallic (complex refractive index), but in general will remain linear if the reflector is for example glass (real refractive index).
Distinti has improbable theories, especially about gravity, but he also has interesting engineering methods for dealing with electromagnetism, which seem serious to me, such as those using "current elements". I had looked at his work eight or ten years ago.