It's a guy called "Michael Winter" on Quora. He seems to have a reputation for exaggarating things on Quora, so I don't know what to make out of it. It is VERY HARD for a layman to figure out what is true about EW.
Here is some cut-and-paste of his writing:
"SPECTRA is much more than an ECM suite. It took about 40 years of researches to create its active stealth part, it started at the ONERA in 1960, with the goal of making French ballistic missiles launches undetected. In fact, the first application was the fact that France was the first country on Earth introducing a class of stealth navy-vessels, the La Fayette class of frigates.
Rafale’s stealth is already long more efficient than the US-used stealth since the Soviet theory of physical diffraction (cooked by Petr Ufimtsev in 1962. He also wrote a very interesting book about how countering the stealth he himself created!) is USELESS AGAINST RADARS within the E-band (2–3 GHz) or lower frequencies, in other terms, any VHF or UHF radar defeats the US/China-used stealth…
It’s different with Rafale’s active cancellation which is also active against VHF or UHF while it also allows to “delete” the RCS of external payloads---"
-On CF's blog, one guy says that Gripen has built-in jamming against VHF radars. Well, active cancellation is not necessarily the same thing as "jamming". But if Gripen can do it, then Rafale can.
I don't know myself! I am just trying to get some idea from stuff I find with google.
If the Rafale carries antennas for UHF jamming, then it will be able to perform active cancellation in that frequency. There's no doubt about that.
But the Rafale F4 will definitely carry receivers for UHF since 0.5GHz to 40GHz is the future of EW suites along with ultra-wideband arrays.
Compared to the standard French Rafale, the Indian Rafale comes with additional jammers.