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It is on the tenth line of the article you posted That is due to a different technique (11 line of the article )

Read carefully , they only thing which indicate the flat design does is mask internal hot engine part which only will be visible if you are behind the aircraft

https://aviation.stackexchange.com/questions/21081/advantages-of-square-over-circular-engine-nozzle For decreasing IR signature the length of the nozzles have to be longer to allow the cool air to mix. For F 22A it is mainly for rcs.

What I understand is that since the angle at which we look at the target changes so there will be a change in RCS and with that change we can track the target @StealthFlanker Can you explain the concept Thanks in advance

The had ToT for all the machinery so now the can make it in Russia,they were preparing for it after the Georgian war so they were well prepared .