I had a surgical fusion t8-t12 about 5 years ago with metal work and a spinal cage after a snowboarding incident!
I have to say that I still feel pain most days, some better than others, and if i spend a day on my feet like I did yesterday then it does hurt a lot.
However for riding I find that it does help, in moderation though, long long days can have teh same effect in terms of pain but if i dont ride I seem to suffer as well so like all things it seems to be about balance.
Mine is a bit higher than yours though so I have less issues, i suppose, with load and more with reach, so I ride a shorter bike (not easy these days!).
Oh and ibuprofen is your friend as is a good mattress.
I take mine as it comes as mine was an accident so could have been so much worse.
Not sure this will help but hopefully I at least can relate to the weird sensation of having a bit of your back that no longer moves…