If you had gotten one of those spadices pollinated, it would look like this
This is a spadix from an ALocasia cuprea that I hand pollinated. See the fat little ripening green berries? They will turn red when ripe and ready to be planted.
The important thing to remember is that the spadix of an alocasia, colocasia or xanthosoma is divided into 3 sections. The top roughly 1/3 is where the pollen is produced. The middle 1/3 is barren, kind of a no man's land. The bottom 1/3 is where the true flowers are produced. In order to pollinate it you have to open up the fleshy sleeve and get the pollen all the way down to the bottom 1/3 to the flowers