Actually the described incident seems to be some GIs having fun wioth captured stuff, but 25mm DU (or 30mm APFSDS for that matter) seems to have enough potential to punch through side or rear hull of most tanks (as it can do in game) - given you're lucky enough to survive to get close enough
After all T-34 would be able to destroy Abrams, if it gets to flank or rear. Or M3 light or T-70 for that matter