Yeah, Ferrari messing up the strategy is something you can bank on.
It does seem that Fred uses the random Ferrari strategy generator a lot less than Binotto did. Having said that LEC is also good at making his own bad luck in the race after crushing it in quali.
Neither Fred nor Matthia make up strategy calls. That’s what the strategy team does. The team principal might give his 2 cents, and probably can veto stuff, but the strategy is made by the strategy team, with some input from race & performance engineers, drivers and the head of race operations (or whatever they are called at ferrari)