Because against an aggressive group of players who are deeper-stacked you can get your stack in preflop and not face any difficult decisions, always realize your equity and get a chance to 3-5x your stack while only having to beat a hand or two at showdown because the larger stacks may bet other stacks off the hand post-flop.
Now you have that dead money in there while only needing to beat a hand or two instead of five. That didn't happen in this particular instance, but it's a sound strategy in games where either:
1. You don't have the roll to play it fully stacked
2. Your opponents are more aggressive, have deeper pockets or have a greater level of skill than you
Yes there's a variance issue to consider, but at the same time it is offset by the possibility of 3-5x'ing your stack while having decisions that are pretty easy to make given your shallow stack depth.
I didn't "get it in five ways". I was the guy shoving preflop and putting the decision on the other players. I didn't "call off" with an 8-high double suited rundown after four other guys were all-in, I was the first all-in. But keep trying to twist it to fit your narrative