most people dont realize how short range the mig29, su25, su27/30/33/35 are. the long range loiter air superiority of the USAF has never been on the table. they are good at intercepting a looming nato 'invasion' of russia but dont do well outside of that homefield advantage.
I didn't watch any of the videos, as based on your summary, they must be full of rubbish.
The Flanker series is *by far* the longest ranged air superiority fighter in the word. It doesn't have an equal in that regard (excepting maybe an F-15E with CFTs - and its not really meant to be an air-superiority fighter, its just based on f*king brilliant one F-15C).
Furthermore, in the early-mid 1980s, with the Fulcrum, AA-11 Archer and the HMS, the MiG-29 would probably have been the dominant factor in any air war between 4th generation jetfighters.... and that's not just my opinion, that's the opinion of most of the NATO (including US) aircrew that flew DACT against the old East German Fulcrums after "the wall" came down.
After that, as you said, funding gaps and an emphasis on kinematic warfare over electronic warfare has left them 30 years out of date from the point everyone else migrated from 4th generation (F-14, F-15, F-16, F/A-18 A-D) to 4.5th generation (F/A-18 E/F, EuroFighter, Rafale, Gripen) never mind 5th gen (F-22, F-35).