From what I can gather in the cases I've seen, they are IRIF'ing the "expensive" positions then rehiring at a lower rate, especially if the rehire is offshore. But even if the rehire is onshore, they can IRIF a position that was $50k with someone that doesn't have as much experience for $30k. Or, they can rehire a 1099 contract employee and get out of having to pay the Benefit load.
This is no big news and we all know how this game is played, but I felt that more people should see this truthful post on the board. OP is @XC6MMuR-1vyz