vfr,
Its cold up there - tell him to take the woolies. An EPIRB is $250 Oz dollars worth of excellent insurance, there is hundreds of overflights each day to hear it, and there are three or four well equipped twin EMS machines with homers within 30 mins flight time!
Chances of a bushfire at the moment are the same as you lot lifting the World Cup in November - very very slim!

. Basically, dont worry about it at all, although it might be a good idea to find out about back burning activities by ringing the NSW Rural Fire Service or NSW National Parks & Wildlife directly. Snake bites are also a rarity at this time of year, spiders are no issue, there are no sharks in the mountain rivers, nor jelly fish!! It is a great place to camp and walk, and it is quite frequented year around by walkers and campers, so he wont be too remote.
But watch out for the yowies!!