This kind of vacation is something employee know before it happen for months.
Or at least a month. So no such a LAST MINUTE VACATION.
They are proper company with proper rule and discipline. Something like this is what a fobbiden thing to happen.

They just can announce that they will go on vacation on X date to X date and around that time will no update.
But they just leave without say anything it's unprofessional.

If someone still want to continue support them it's their choice.
But now I have to flee from them even I don't want to.

Can you imagine how unprofessional dev will do with your game?