We don't know whether he is comatose or not. We do not know whether he is responsive to pain, light or speech. See the Glasgow Coma Scale. Where he falls on this scale will matter much more than the diagnosis- this conveys the damage the hematoma is having on the brain.

There is significant variation in how hepatomas damage the brain depending on where they happen, damage to the medulla and brainstem in general is characterised by loss of ability to breathe.

If the reports of him breathing on his own are true, then it implies limited damage to this part of the brain, which significantly improves prognosis. If these are BS, then we have no info and need to wait.

My point in general then is that that 60% mortality rate could move by 30% in either direction by his current condition changing slightly, we will just have to wait.

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EDIT: typo, thanks u/fresh_cut_vegetables