Looks like the completely changed their website and removed all mention of backcountry skiing and to use this device inbounds only.
If you're going to take your 6 year old skiing in the backcountry, they should know exactly what to do in the event of an avalanche. Train them as you would any adult, or leave them at home. I started going hunting, fishing and whatnot with my dad by the age of 5. I was already learning map and compass and survival skills by then, and could drive our old Landcruiser by the age of 8. My dad theorized that if anything happened to him, I could at least find my way to the rig, and get myself to somewhere to find help.
I currently haven't taken a full 3 day avy course, but I will before I spend any time in potentially high danger conditions. I also will not go without a beacon, probe, and shovel, or with people without the proper gear or training. If my life is on the line, I want people searching for me with the proper gear and training, because I will only have minutes. I also need to be trained as an effective searcher to help anyone in my group that may be buried. Wilderness Medical Society hypothermia protocols specific to avalanche burial give you 30 minutes under the most ideal conditions: air pocket, no severe trauma, and core temp still above 90f/32c. In reality, without an Avalung or BCA Float pack, your chances of survival after more than 5 minutes of burial are slim. Just ask a good friend of mine who has pulled people both dead and alive from avalanches. 5 minutes, both times, and the one who lived had an Avalung.