This sounds like a variation of Brooks's Law - adding people to a late software project makes it later. In this case, now you need to take time to help the new

This sounds like a variation of Brooks's Law - adding people to a late software project makes it later. In this case, now you need to take time to help the new resources ramp up, and the new resources themselves can't make meaningful contributions right away. So the pressure isn't alleviated for a while, and in fact goes up.