Be sure to have a conversation with the PB about proper compaction of all the backfill material. That site material can not be properly compacted to put your deck on. You now have some very deep fills which most gunnite pool installs do not have. You will need a good granular material compacted in lifts or clean stone (which does not require compaction) as he used below the pool. Driving over the material or letting it settle over time are not acceptable compaction methods an will lead to settling material.
Just to clarify - prior you had suggested a gravity drain to empty to adjacent creek at lower grade - you mentioned below a wick drain which I believe is more complex
Is a gravity drain the solution you would recommend as I believe that’s where a catch basin under the pool base/low point (buried in gravel ??) Catches the water and runs it to creek
Probably should have done that prior to rebar