Indeed.
And of course in a case such as this there can never be empirical "right" or "wrong" - given that this man confessed to nothing and there's no other direct* evidence of any kind. All that is ever possible is an objective, rational, intelligent analysis of the available evidence, leading to a set of inferences and ultimately to a deduction about either what must have happened, what might have happened, or what definitely could not have happened.
And in this case, I strongly submit that such an exercise leads to only one unequivocal deduction: that a) this man must have had the intent to at least seriously injure Millane on account of the very long period he must have continued choking her after she fell unconscious, b) this man caused the death of Millane from choking her, and c) this man's actions immediately after Millane's death and in the ensuing 36 hours are only compatible with guilt. And this combined deduction can only lead to a finding of murder.
* ETA: I'm making an assumption that people reading this post know what is meant by "direct evidence" in the context of a criminal trial.
"All that is ever possible is an objective, rational, intelligent analysis of the available evidence, leading to a set of inferences and ultimately to a deduction about either what must have happened, what might have happened, or what definitely could not have happened."
No use writing this stuff and so pretending that is what you've done when you haven't. We've now got 'instantly', a matter of 'seconds' and up to '90' seconds. 'Instantly' (as in a common source of death) comes from a world leading authority. Immediate unconsciousness was dealt with at trial - but there is no record of 'instant' death being raised, recovery from shallow breathing when pressure is again applied - or an explanation as to bruising on only 1 side. Nothing to do with photos or what he 'must have thought,' sorry.