If it's the case that the Russians and Chinese now have radar systems that remove that radar superiority, the F-35 now looks like even more of a gigantic waste of money
The F-35 was designed to be stealthy, not stealth. It doesn't need to be undetectable, as it's not a strategic bomber, it just needs to be able to get missile lock on it's foes before they get missile lock on the F-35. That doesn't seem like to change any time soon.
While any new military project whatsoever will be ridiculed as a colossal waste of money by the left ("it doesn't cost anything to just be nice to everyone!"), the main problem with the cost of most of the recent programs is a large R&D cost that isn't spread across enough planes/ships/whatever. I'm not the biggest fan of the F-35, but at least the idea of having one plane that will be used for many roles and by many allies keeps the per-unit cost from being insanely high - it's a wise procurement approach in a time of quickly falling defense budget.
It's no longer all about whether the F-35 can detect a Su-35, J-10, etc. with it's onboard radar first or not. Sure, being able to see the opponent on your onboard radar first is an advantage the F-35 has and it is an important one but modern fighters that operate in an integrated and networked air defense system, situational awareness can flow from many different sources these days other than just your fighter's onboard radar. The Su-35, J-10 (or whatever) can give the F-35 a very hard time if it carries IRTS, is connected to a battlefield networking system, backed by AWACS, ground radars and other sensors capable of seeing F-35s and is protected by modern SAMs. The resiliance of such a system is even greater if the missiles fired by the Su-35 can receive mid-course updates from systems other than the launcing aircraft. The Russians already have air to air missiles whose guidance can be handed over to a nother aircraft or a ground or air based sensor system which can be a long band radar since you only need to get the missile close enough to detect an F-35 with the missile's onboard sensor which is what the article is talking about, combining long band radar for situational awareness with short band radars and other sensors for terminal guidance.