Spectra is a full on cloaking device. And it works.
People like the IAF Air Marshal, the French Air Chief, Dassault's VP and CEO won't be risking their reputation and the reputation of what they represent like that.
The Americans screwed up. That's why they think the F-22 and F-35 are going to be useless after 2030. If that wasn't the case, we would have been looking at the restart of the F-22 production line again.
And what makes Rafale a 5th gen is also because of its sensor package and sensor fusion. Spectra is only a part of the whole package.
Remember, only Rafale is advertised among all 4th gen airframes as having stealth capability.
"...software-based virtual stealth technology."
No other aircraft is advertised like this. This document was made available to the officials of various air forces in an air show. You can't simply claim stuff like this if it wasn't true.
Being a major buyer, we will obviously go for the best thing available.
If you recall, the Rafale beat all other western and eastern competitors in a transparent competition.