Saints Cap Moves: Derek Carr restructured, Erik McCoy restructured; J. Williams released; cap space is at -$8,543,537

Again not true , They could have been talking about adding void yrs and that would need player approval, just like we did with McCoy. There are a few things that could have been talking to Carr about other than a pay cut .
Adding void years makes no sense since the contract already has enough years to do a max restructure. 5 years is the most you can prorate a signing bonus and it must include the current year.
I think they wanted Carr to defer part of the $40M to next year. If that deferment was guaranteed to be paid next year then while technically it is considered a pay cut this year and requires the player’s permission, In reality he still gets every penny.