The techniques are not classified, although LE fought tooth and nails to keep details out of court cases for years. IMO, the state doesn't have the right to even keep it non-public.
There have been numerous articles of late that quote her as being in France because of the favorable extradition laws for their citizens, so yes it does strike me as extremely odd.
Biggest news of 2020 so far, if true. Everyone should remember how her picture in NY magazine was faked last year with an encrypted message hidden inside!
Very glad to see Mozilla partner with such a respectable VPN company. However, a caveat I have is Mozilla being a company with an American presence means US LE could potentially get involved in some fashion and target select users. One should sign up directly with Mullvad instead.
If one would like to read more about the insidious relationship between US CI's and LE, The Intercept has some great leaked material.
It really shows how far American TLA's will go to keep their powers, and it's sick.
One other aside I would like to add is when you have topics like this which have the potential of upsetting the powers that be, always look for posts that are low in points/grey. Those will be the most informative while the shill posts get high points. They don't like facts.