It is getting to the point where all the top (living) credibly accused Satoshis are incurring all the cost of being outed as Satoshi without getting any of the upside.
In other words it is almost irrational to deny it is you (if it is really you) if you are outted after a major investigation by the paper of record, so it is rational to take Back’s denial as honest.
His security is already screwed anyone who is incentivised to harm him for billions will already do it for tens of millions (or if they think there is more than 50% chance Back is a multi billionaire), so he might as well take the credit for it and live with the consequenes if it is really him.