I don't know how to answer that one, MJ.. It is possible that , having confessed to her murder, and producing the body of Lynn BEFORE he runs an appeal, well,...a bit knocked off. A few years, perhaps, bearing in mind, that for murder, in NSW, 20 years is the mandatory sentence. He gets 20 years regardless of what mitigating matters he may now decide to bring before a judge...
He will certainly appeal, it is his right to do so, it is very rare that a murderer does not appeal, because it's playing the odds. You can't win if you don't play, so his appeal will be a certainty, I think. On what grounds, that would be the big question. A matter of error by the judge? ,,... some glitch in the witnesses that he can prove to be incorrect?.. he doesn't have grounds enough as far as I can tell... He may get a hearing for an appeal though,, and be struck with an extra years sentence, this does happen, quite a lot, really. So it's a gamble, but he is a gambling man.
There was no jury, so he can't whinge about a bad juror!!
ps Regards to Bloor sT.. ( I used to live in Toronto ,, Scarborough) ..