GM what were you thinking? Even with a grinder I spent most of the weekend working on this mod. If you use a grinder make sure you move everything out of the way especially that cable with the black housing. As the OP stated, a magnet helps to get the pin out. Thank you for turning us onto this mod. I found the below video to assist on seat removal.
https://m.youtube.com/watch?v=7kEPtLMQLPI&t=197s