Interesting! I am definitely learning a lot here. Ive also become some sort of a sump pump expert through this experience.

I took a stick and stuck it into the pond, theres only 6in of water above the surface but the soil there is all mush, so if you step in it sinks pretty far. Need some high boots to navigate it.

Regardless if its a surface water or groundwater, I would still like to divert it. Would my strategy be different between the two cases?

It looks like given the slope I can dig 2 ft into the pond center and have a frenchdrain there. I would imagine in the case of surface water buildup only, I wouldnt have to go in too far, but for groundwater, wouldnt it be deeper the better?