But his account is wholly consistent with what the commentator said live, with what Carragher stated at HT and (while I know these points aren't definitive) with the angles that were shown to us live that only showed the hand touch late in the review, and the speed of the review.
Conversely, if you want to believe the official account, we must accept that a lone VAR directing a replay operator managed to
* identify the first obvious arm contact
* rule it out as HB
* identify the second hand contact
* (incorrectly) rule it out as HB
* for some reason, then check and (incorrectly) rule out DOGSO despite already deciding it wasn't HB so there was no possible offence that could have been DOGSO anyway

* report to the ref that it came off his leg (without reporting that
neither touch was not HB and it wasn't DOGSO anyway despite apparently checking all that) so check complete
All in about the same time as it took experienced sports broadcast directors to even find that second HB.
That's simply not realistic IMO - it seems far more likely and in line with the evidence we have that he did the first two steps, then rushed to conclude the check rather than scrolling through the rest of the incident.