He was smart and lucky.
But here is the real deal...
There is the science and there is the tactic.
In order for a tactic to be successful, it
MUST be repeatable or reproducible. If the tactic was reproducible only by Dani, what good is it for the army or the entire war, for that matter ?
The science of 'stealth' is proven beyond any reasonable doubt. It was reproducible before Yugoslavia. The tactics that accompanied it, and there were many of them, were also reproducible. Not by one man but by many.
The F-117 continued to fly missions after that single loss. Now, you can criticize US that we employed more SEAD and made the F-117s flew higher. But then that criticism missed the point about science and tactics.
I will simplify as much as possible without revealing anything 'secret'...
If your radar made out two targets, a SEAD fighter and a 'stealth' bomber, with the 'stealth' bomber as the weaker radar return, if you have to focus your attention on the SEAD fighter, because he is hunting you, you just lost the battle. Since the 'stealth' bomber is the weaker radar return of 1, your radar will require more time to acquire as much radar returns ( 1+++++ ) as possible to create a tracking solution. But precisely because you were distracted by the SEAD fighter, that momentary loss of focus is all the 'stealth' bomber need to get pass you. So instead of 1+++++ you got 1++ . Your radar sees it, but could not provide a tracking solution.
Zoltan Dani got lucky. He had to fire multiple missiles. According to the F-117 pilot Dale Zelko, he had to dodge at least two missiles. That meant Dani employed the classic 'spray and pray' tactic. Whatever 'magic' Dani did to his radar, it was not reproduced by other air defense commanders. Whether he could get the info to them or not, or that he did but the procedures were too complex, is for another debate.
http://www.nellis.af.mil/News/Article/284637/one-of-a-kind-squadron-trains-airmen-from-ground-up/
The 507th is pretty much the best, if not the only, kind of training squadron in the world. The 507th provides both science and tactics of air defense so that our airmen can create their own countermeasures against what the 507th can bring. The squadron often go on the road, providing custom training programs. They can bring their entire complement of genuine Soviet/Russian air defense radars or just one unit, depending on the host's requirement.
I have friends at Nellis who works closely with the 507th. I will not say what the squadron have in terms of hardware, but I can say this: They can replicate what Iran has in terms of freqs employs and better air defense tactics than Iran can create.