Way too early to tell. The F-117 have altered the EM warfare landscape much more subtle than people realized and so far, only the US have managed to exploit those subtle changes to its advantages regarding air warfare doctrines. Crucial to the reexamination and reorganization of doctrines are experience. We know which tactics worked well, which worked not so well, and which failed. However, what failed may be because of the inability to evade certain EM warfare tactics by an adversary. So what tactics that failed against certain types of target may have been revived by 'stealth'. And did in many instances.
The PLAAF does not have that foundation of experience upon which to reexamine and reorganize its air warfare doctrines. Not one PLAAF pilot know what it is like to experience frustration from a wily EM warrior, how to examine that problem under combat stress, and finally how to defeat and/or bypass that EM adversary. It is like giving a rifle to someone whose experience consists of swords and spears, not including archery. It is unfortunate that the Chinese members here have a low opinion of experience.
The PLAAF have no choice but to do a lot of guesswork regarding air warfare doctrines on how to exploit the J-20's low radar observability advantages over regional air forces and air defenses, assuming the high latitude that the J-20's low radar observability is comparable to the F-22, and assuming the US will have no hand in improving regional allied air forces and air defenses.
But...I will go out on a limb and say that based on experience on our part, lack thereof for the PLAAF, and despite the benefit that the J-20 is technically comparable to the F-22, the J-20 will not pose a credible deterrence to the F-35, let alone a dedicated fighter like the F-22.