That is correct.
The entire so called 'analysis' is filled with extreme hubris for the J-20 and the usual technical suspects that have been debunked here over and over and over and over and over...
But the three best lines have nothing to do with aviation...
Whoever wrote that tripe obviously have never experience Red Flag, REFORGER, tank training in Ft. Irwin, and many more, including Desert Storm. The author is clearly confused between capability and ability.
The PLA's leadership would love to have even half of the US military experience.
Now here is the best...
By what metrics did the author based this upon? Since the turn and start of the 20th century, the only military peer the US had, including WW II, was the nuclear powered Soviets and both sides never directly fought. Isoroku Yamamoto of Imperial Japan knew his country lost the day he attacked Pearl Harbor. The Soviets backed down in the Cuban Missile Crisis and stayed out Viet Nam while US troops actively fought in the region. So by what metrics did the author used to gauge that the US fought against a peer and lost said institutional memory?
This also begs the question of when did China fought against a peer, let alone a military that have extensive global presence and experience that the author derided. Answer: Not.
So if the PLAAF never fought against an opponent that set the standards on 'stealth', air combat tactics, training, organization, low level penetration, radar network avoidance, precision bombing, strategic and tactical reconnaissance, adversarial role playing, foreign technology exploitation, and many other areas,
what make this author so confident that the J-20 alone have turned the table?