I think they would have worked, had he dedicated his time to his health, when needed, and going all the way

Alternative medicine states that he got pancreatic cancer cured twice. Both times he returned to the same EMF - unforgiving environment in Apple. He seemingly had also heavy metal poisoning - starting at least when he was teenager assembling computer parts. Also he was vegan, but he was rich and with little time spent on health, so he ate gourmet food - not exactly the healing kind, which is raw vegan food with control of the source of the food, and for example not heating the oils to toxic substances.
As an example - I had a Dal soup in a high end restaurant, which has the reputation to be of excellent integrity, yet I had to pull out the info on what was I reacting to (turns out it was non-organic psyllium powder) as if I was pulling a tooth from the mouth of the cook.
We can speculate as much as we want, unfortunately Jobs is no more here to tell us what he thinks. Also - he did not take much time off, which he should have in my opinion to let his body take the power and heal definitively, when it was not too late.
There are stories of ppl who heal cancer, but start too soon either training for a marthon or engaging in heavy duty work, and unfortunately their cancer may return. BTW these are also ppl who once having the victory feeling, unfortunately loosen the belt back for not-so-healthy life-style and the results are sad.
Now, if a pancreatic cancer is treated conventionally it has lower survival rate and time-left-to live compared to what Jobs experienced.
Well, these are my speculations. I do not pretend knowing all answers or details.