Not particularly. I believe that when Flamingo Land in the U.K. picked it up they attached backpack straps to the seats, but the trains have been the same otherwise.
That being said, the trains were completely torn down to their chassis(es?) when it was moved to La Feria. See here: https://rcdb.com/3605.htm#p=16503
When it was in the UK at Flamingo Land, it had 5-point safety harnesses like you'd see installed in a race car. Thankfully I managed to ride it a few times as a kid, I really enjoyed it.
Its wierd to think about such a brutal accident happening on a ride I was on (albeit a long time ago).
I'd hazard a guess and say the intensity of these rides, combined with age and it being difficult to spot defects in rides; means this sort of thing could easily happen to a lot of coasters if not thoroughly inspected very regularly. I imagine as these rides from defunct manufacturers get older, finding spare parts is harder, and so things may be repaired a lot more often than in the past; where perhaps brand new spare parts would have been possible to get easily.
^ This is all just speculation/my opinion though.
What a shame to lose lives because of this