ThanksHere's the kill stats they got: 424 scouts and 22 interceptors (7 cyclops 4 basilisk 10 medusa 1 hydra)
As I understand it, just dropping out of supercruise and hitting whatever showed up.
So that Commander effectively proved that you can get a decent shift without completing CZ, missions, or any particular signal source.
That shows that killing Thargoids in general contributes in some way - that makes me feel better!
Presumably then, completing CZ, missions, etc. will add to that result, but progress isn't dependent on any completions. Very nice info indeed!