Does the first black site mission provided reset the Advent Project countdown timer

xcom-2

I am drawing out attacking Advent "black sites" as long as possible to extend my preparation window for my troops.

Does the very first, game provided black site operation (designated by a gold-ish colored factory icon) reset the Advent countdown timer? Or does assaulting only the red designated facilities do this?

Best Answer

Yes, the Advent Blacksite mission reduces the Avatar-progress by 2 pips (Legend difficulty) and will stop the timer, if it's already running.

Other facilities will reduce the progress by the number of pips shown below the facility on the Geoscape.