^^^ Please forgive me if I don't get this right, it's been years since I last watched StrikerS and I have a notoriously foggy memory, but if I'm not remembering this wrong, we don't actually get to see any of that, right? Like I think it was mainly just characters recounting the event for the most part (again, I could be misremembering) because I do remember being kinda disappointed with that.
I'm really into depictions of serious injuries in magical girl shows and how it affects the characters (and conversely, I don't like when chronic or life-threatening injuries are just handwaved as not a big deal, like the new version of Nanoha's accident), and while I do recognize and appreciate Nanoha's accident had actual narrative weight in regards to the particular arc it played a part in, I do recall feeling bummed out that 1: we didn't actually get to experience what she went through first hand, we just hear about it in kind of like a "noodle incident" fashion, and 2: it wasn't even brought up in relation to Nanoha herself and her character's narrative, but in relation to Teana as more of like a cautionary tale (though that is owed largely to the fact that Nanoha is not actually the protagonist for most of StrikerS and so we don't get a lot of stuff from her perspective).
So all in all, while I do agree the new version of events is pathetically insignificant, I'm not too bothered by the change since the original version didn't hit as hard for me to begin with.
Again, I'm not the best at remembering things, so I could just be getting my wires crossed