I really can't even imagine how unpleasant such a hard, jarring landing would be with a long fusion or fusion to sacrum. It seems ridiculously foolhardy to me, and without seeing the website or claim, it seems like the surgeon is being boastful about how great his results are.
I thought I was interested in skydiving once, a long time ago in my early twenties. I called some skydiving outfit and was told that they would strongly discourage me from ever trying it, and at that time, I had just a L4-S1 fusion.
Gayle, age 48
Oct 2010 fusion T8-sacrum w/ pelvic fixation
Feb 2012 lumbar revision for broken rods @ L2-3-4
Sept 2015 major lumbar A/P revision for broken rods @ L5-S1
mom of Leah, 14 y/o, diagnosed '08 with 26* T JIS (age 6)
4/08 26 degrees, brace 16 hrs/day
9/08 17 deg. OOB - brace discontinued
9/09 30 deg, resuming brace
5/10 VBS Dr Luhmann Shriners St Louis
4/15 stable 5 yrs post-op, 18* T/ 22* L, Risser 2
also mom of Torrey, 10 y/o son, 16* T, stable