it's a suicide because of the count? (or the situation?)
Situation. Though it really wasn't a suicide play.
A "suicide" is one of the two variants of the squeeze play where you bunt with a runner on 3rd and bet that the runner can get home quickly enough to negate any attempt to throw the ball home for the out (forcing a worst-case scenario of the batter being out at 1st, best case that he beats out the throw or there's no play and he's safe). This of course also depends on the hitter putting the bunt into a good spot that makes said throw home as difficult as possible.
The variations are the safety squeeze and the suicide squeeze, dependent on when the runner at 3rd takes off.
In the safety squeeze, the runner waits for contact before leaving 3rd for home.
In a suicide squeeze, the runner goes as soon as the pitcher begins his delivery home. Making it like a sort of attempted steal of home, betting the batter will be able for sure to make contact and prevent the runner from just being tagged out on the pitch reception.
https://en.wikipedia.org/wiki/Squeeze_play_(baseball)
In actuality this was a safety squeeze attempt. The runner was clearly waiting for contact before he'd break for home.