That may help slightly, as it lowers the water’s ability to hold dissolved gasses. So boiling it beforehand will force out a lot of the gas that would have become air bubbles. But it’s not perfect, and results vary a lot. There are two main ways to get clear ice:

1. Keep it moving while it freezes, so the air bubbles can escape
2. Insulate it so it only freezes from one direction.

Basically, the air bubbles cause foggy ice. And air bubbles tend to get trapped because water freezes from the outside (where the cold air is touching it) first. This forms a hard shell, which then traps the gas and causes foggy ice. By agitating the water, you ensure that it doesn’t start freezing until all of the water is ready to freeze. It prevents the shell from forming first, meaning gas can escape the center of the cubes as it freezes.

For the second method, by insulating it, you ensure that the water freezes from one direction. For instance, if you fill an ice chest/cooler with water (effectively insulating it from the sides and bottom) and throw it in the freezer without a lid, the top half of the cooler will be clear ice and the bottom will be foggy. Because as the top freezes, the gas is able to escape down towards the bottom of the cooler. So your ice doesn’t get murky until the gas runs out of room at the bottom of the cooler.