I am not so sure. Unless the team have people at Brackley and/or Barcelona. Also interesting that the motorsport press were unaware, and they have likely more sources than rival teams.
Interesting point that this raises however, is how do the FIA make sure that no testing is going on anywhere? could Ferrari not create an extra car, and ship it off to a secret location somewhere to do some testing? How can that be monitored if the team in question does not want it to be?