But this plane is not a stealth.So, the F-22 will shot down it without any problem, and the super-flanker pilot will not understand what happened.

MUHAHAHAHAHHAAHHAHAHA!!!!!!!!!!!!
The aircraft which probably gets most of its stealth capability from its paint and (rumour has it) the electro - magnetic plasma field around the aircraft. This technology is one of the most closely guarded secrets of the Russian Airforce and details are not published yet. However I found this article and re-produce it below.