You are absolutely correct 100%. My criticism was intended for the subject matter of the tweet and not at you whatsoever. So thank you for pointing that out.
Australian Power, ey? Wasn't that the same group that trashed the F-35? Remember all the nonsense they spewed about that aircraft and now they're comparing the J-20 to it. Kinda shifting the goal posts wouldn't you say?
Kopp is actually pretty good and I've read a lot of his stuff on radars and much of it is pretty informative. But even still, much of what he lays out here is speculative when you really get down to it despite all the information he uses and lists. Even the section you quoted shows him essentially giving the Su-57 better beam aspect specular RCS behavior than the F-35 but almost in the same breath he compliments the J-20's divertless air intake because it's similar to that of the F-35.
My point is that we really don't know much about the Su-57's stealth performance and until it's actually completed and out there flying with everything on it that it's supposed to have, then have at it. Right now it wouldn't be fair and neither would it be for the J-20 until the engines are also complete and we have stats to go by.
Hey hey hey woah take it easy. No where in my post was there a knock on China whatsoever. lol, that's the thing around here you really have to watch your words as any form of disagreement can be taken badly.
Much of what Russia has suffered through has not been imposed on China whatsoever, and actually quite the opposite and particularly in the form of sanctions. Russia doesn't have the indispensable funding to pursue much of those carrier projects you referred to amongst other things.