he is not wrong, pretty much from above the F-22 has intake shielding, stealth is no magic in fact pretty much with high school physics you can understand it, J-20 or F-22 are not magical machines, they still are visible to radar.In your image, none of the jets are stealthy at all. In this angle Su-27, F15, J-20, F-22, F35 make no difference at all. You are exaggerating.
To be honest, I knew expert in China. They involved much deeper in Radar field, and stealthy design. You are just a user, like I am a user of cars.
Very disappointed. What you provided is inaccurate, not solid evidence, and a lot of things you can NOT explain at all.
Planforming works basically as signaling mirrors, the chines of J-20 or its flat nacelles are mirror like surfaces
the sun rays have to be reflected into an angle to concentrate a beam of light visible for a pilot to see it, stealth is the opposite, you want that electromagnetic radar emitted signal on an angle with the radar to concentrate most of it on an angle away from the emitter
that last picture shows a woman concentrating light on a mirror and the next picture of J-20 with canards working like the mirror that the woman is holding
For a radar those canards are reflecting a very strong signal and bouncing them back to the radar increasing J-20 radar cross section, the plates of F-22 intake caret are mirrors that are aligned to the chines, J-20 has intake bumps working like a christmas tree ball in term of reflection and a Prism in terms of diffraction
diffraction interference can not cancel the whole radar signal, it is more like this
the number of slits creates an on and off light pattern, what he is telling you some patterns are betters than others, with 7 slits basically you are reducing radar visibility as well as it happens in light.
however you have to consider, flatter a plane with less control surfaces stealthier it becomes for low power radars, the reality is J-20 and F-22 are visible at least according to Chinese and Russian technology but S-400 claims it will down stealth machines.
So he is not wrong however stealth is more propaganda, if you know a bit of thermodynamics you will know, nothing can be made to do not reflect, emmit, absorb or diffract electromagnetic emissions
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