Using HARMs that’s easier said than done.

Ah yes and you know this for sure do you? i take it you have witnessed first hand a saturation attack using HARMs and other munitions to disable a SAM system.
I think that HARMs now are rather different then they were during allied force in terms of there internal electronics/seeker and stuff, feel free to correct me if i’m wrong on that though.

S-400 integrated with Kolchuga or Vega systems(passive detection) can stop used to detect and bring down F-22 / or other Stealth Systems …

You seem rather certain of that fact which is rather nieve to be polite, i don’t think anyone with public info can say for definate that it can or cannot down F-22 / or other stealth systems. One thing i will say its not beyond the USAFs abilities to saturate a modern sam site with anti radiation, conventional munitions and severe EW attack rather easily. Yes it would mean big ‘raids’ but it would get the job done.