Honestly, the main modification I made to workouts when pregnant was to not lie flat on my back when my belly got really big. I did regular workouts, just avoided impact (because I couldn't stand my big belly bouncing around!). I'm not sure what "loading of the spine" means. Do you have a link to that info?
Oh, and as I mentioned in the check-in, I have no idea if my diastasis happened during pregnancy or only because of my c-sections, but my abs look pretty good now. There's still a small separation. The real issue is the extra skin! I look fine upright, but in plank position, my belly looks like an udder. :/ Not that I often find myself in plank position with a bare belly in public places.