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But there's more accom options once you get to the east coast so it's probably less necessary to sleep rough.
I actually found that there were better accomodation options in the Nullarbor than elsewhere!
Apart from the cities most the route is still remote, on a weekday the Coorong is quieter than the Nullarbor, and riders from last year who did the full route said they saw fewer people on the inland bits between the climbs than the Nullarbor.
The other problem is that stuff closes early. In the little towns you can't count on rocking up at a hotel after 8pm, even if you have a reservation, and getting in. Midnight - no chance. In the Nullarbor what places there are at least stay open decent hours!
He might want warmer gear after Adelaide, but he could buy a down jacket there. It got cold in Victoria last year. That was by the coast, there could be snow in the mountains, they had it in early March last year.