I remember these! I forget when or why they were removed, I don't know if it was even mentioned. It might have had something to do with pathfinding (dying soldier occupies space, blocking live soldiers).
But this should be the same for crawling soldiers?
I mean, the above posted animations are very gruesome. Maybe Relic took them out as a premeasure before CoH2 could be branded as a brutal game? My feeling is that CoH2 has lost quite a lot of it's terrifying shock factor over the last years, maybe it is part of "making the game more competitive" to not distract from competitive aspects of the game. But this is also due to the lowered wipe potential of many weapons like mortars .Seeing your soldiers die in a very "dry" sounding and looking explosion while playing a game for fun had something very distressing for me. That's why I was a bit flashed by CoH, because war was presented in a non moralistic, brutal fashion.
But that's a very wild guess. I think I have not played CoH2 long enough to remember if these animations have been in earlier builds or not.