They're long odds there but really, anything could happen in any particular game. All last year's games really taught us is that an NBL team can go blow-for-blow with an NBA team in the right situation, and that they tended to do so after acclimatizing to a first quarter culture shock. The chances of one actually getting the W, to me, still seem fairly unlikely despite what Melbourne did last year. So is it fair to say that the Sydney Kings could beat the Clippers in 1 of 19 games? Yeah, that might actually be a fairly accurate appraisal. You have to consider the massive talent drop as soon as the Kings rest their starters. If the Kings could play their starting 5 for an entire game you might have a bees dick of a chance at an upset.
Melbourne, Sydney, New Zealand and Perth will fight admirably and optimistic outlooks for them would be scorelines under 20 or 25, with a few Boomer-level Aussies or highly regarded imports showing out. I don't think Adelaide has the capacity to be in any way, shape or form competitive with an NBA team and I expect them to be absolutely demolished, sad to say.