Also, the data would be from simulations. Outside of Ukraine, there haven't been many fighters of advanced nations shot down in decades.
Terrain maps beyond a certain resolution are classified. As I remember, the somewhat lower resolution terrain maps were still ITAR controlled munitions. Some of the radio propagation models are classified.
Even half-way decent simulation outputs are likely also classified.
In my case, for the most part, the simulations were used to shorten the turnaround time in the early prototyping stages, and also a fair amount for the sales team to sell military hardware to governments.
The topic of "spectral stealth" is complicated. It is vulnerable to systems of networked radars, among other things. It is one feature that may be very useful, but it is not a "panacea".
There is little to suggest that the Israeli F-35 was taken down by a missile; the sources involved are not especially credible. Eurasia Times, for example, is basically Russia Today (RT) and is not really trustworthy. Most of the posts elsewhere, e.g. Quora, are from questionable accounts and aren't credible either.
It's possible it happened and they're spinning it as something birds -- which is pretty lame and damning if true -- but most of the pro-shot-down points are difficult to take seriously.
If true, I don't think it necessarily presents the F-35 poorly. But it's only a rumour. And if true, it most likely would be classified as secret, since reporting it would be like handing the enemy a damage assessment report.